Fix overriding of prime tower position

We had changed it for all printers back when we changed the prime tower position to a formula, but since then we've been getting new printer definitions that were made from templates floating around with the old structure.
We should really have an automated test for this.

Discovered during review of #6518.

resources/definitions/Mark2_for_Ultimaker2.def.json

@@ -209,10 +209,10 @@
             "enabled": false
         },
         "prime_tower_position_x": {
-            "default_value": 185
+            "value": "185"
         },
         "prime_tower_position_y": {
-            "default_value": 160
+            "value": "160"
         },
         "machine_disallowed_areas": {
             "default_value": [

resources/definitions/builder_premium_large.def.json

@@ -50,8 +50,8 @@
         "speed_wall_0": { "value": "math.ceil(speed_wall * 20 / 25)" },
         "speed_wall_x": { "value": "speed_wall" },
 
-        "prime_tower_position_x": { "default_value": 175 },
-        "prime_tower_position_y": { "default_value": 178 },
+        "prime_tower_position_x": { "value": "175" },
+        "prime_tower_position_y": { "value": "178" },
         "prime_tower_wipe_enabled": { "default_value": false },
         "prime_tower_min_volume": { "default_value": 50 },
 

resources/definitions/builder_premium_medium.def.json

@@ -50,8 +50,8 @@
         "speed_wall_0": { "value": "math.ceil(speed_wall * 20 / 25)" },
         "speed_wall_x": { "value": "speed_wall" },
 
-        "prime_tower_position_x": { "default_value": 175 },
-        "prime_tower_position_y": { "default_value": 178 },
+        "prime_tower_position_x": { "value": "175" },
+        "prime_tower_position_y": { "value": "178" },
         "prime_tower_wipe_enabled": { "default_value": false },
         "prime_tower_min_volume": { "default_value": 50 },
 

resources/definitions/builder_premium_small.def.json

@@ -49,8 +49,8 @@
         "speed_wall_0": { "value": "math.ceil(speed_wall * 20 / 25)" },
         "speed_wall_x": { "value": "speed_wall" },
 
-        "prime_tower_position_x": { "default_value": 175 },
-        "prime_tower_position_y": { "default_value": 178 },
+        "prime_tower_position_x": { "value": "175" },
+        "prime_tower_position_y": { "value": "178" },
         "prime_tower_wipe_enabled": { "default_value": false },
         "prime_tower_min_volume": { "default_value": 50 },
 

resources/definitions/cartesio.def.json

@@ -44,8 +44,8 @@
         "prime_tower_enable": { "default_value": false },
         "prime_tower_min_volume": { "value": "0.7" },
         "prime_tower_size": { "value": 24.0 },
-        "prime_tower_position_x": { "value": 125 },
-        "prime_tower_position_y": { "value": 70 },
+        "prime_tower_position_x": { "value": "125" },
+        "prime_tower_position_y": { "value": "70" },
         "prime_blob_enable": { "default_value": false },
         "machine_max_feedrate_z": { "default_value": 20 },
         "machine_disallowed_areas": { "default_value": [

resources/definitions/raise3D_N2_dual.def.json

@@ -76,10 +76,10 @@
             "default_value": 2
         },
         "prime_tower_position_x": {
-            "default_value": 195
+            "value": "195"
         },
         "prime_tower_position_y": {
-            "default_value": 149
+            "value": "149"
         }
     }
 }

resources/definitions/raise3D_N2_plus_dual.def.json

@@ -76,10 +76,10 @@
             "default_value": 2
         },
         "prime_tower_position_x": {
-            "default_value": 195
+            "value": "195"
         },
         "prime_tower_position_y": {
-            "default_value": 149
+            "value": "149"
         }
     }
 }

resources/definitions/raise3D_N2_plus_single.def.json

@@ -72,10 +72,10 @@
             "default_value": "M107\nM1002\nM104 S0 T1\nM104 S0 T0\nM140 S0\nM117 Print Complete.\nG28 X0 Y0\nG91\nG1 Z10\nG90\nM84"
         },
         "prime_tower_position_x": {
-            "default_value": 195
+            "value": "195"
         },
         "prime_tower_position_y": {
-            "default_value": 149
+            "value": "149"
         }
     }
 }

resources/definitions/raise3D_N2_single.def.json

@@ -72,10 +72,10 @@
             "default_value": "M107\nM1002\nM104 S0 T1\nM104 S0 T0\nM140 S0\nM117 Print Complete.\nG28 X0 Y0\nG91\nG1 Z10\nG90\nM84"
         },
         "prime_tower_position_x": {
-            "default_value": 195
+            "value": "195"
         },
         "prime_tower_position_y": {
-            "default_value": 149
+            "value": "149"
         }
     }
 }

resources/definitions/ultimaker_s3.def.json

@@ -68,8 +68,8 @@
         "extruder_prime_pos_abs": { "default_value": true },
         "machine_start_gcode": { "default_value": "" },
         "machine_end_gcode": { "default_value": "" },
-        "prime_tower_position_x": { "default_value": 345 },
-        "prime_tower_position_y": { "default_value": 222.5 },
+        "prime_tower_position_x": { "value": "345" },
+        "prime_tower_position_y": { "value": "222.5" },
         "prime_blob_enable": { "enabled": true, "default_value": false },
 
         "speed_travel":