Updating platform_offset for BQ printers

Fixes the reason why the Cura UI freezes when choosing my printer from
the wizard.

resources/definitions/bq_hephestos.def.json

@@ -10,13 +10,7 @@
         "category": "Other",
         "file_formats": "text/x-gcode",
         "platform": "bq_hephestos_platform.stl",
-        "platform_offset": {
-            "value": [
-                0,
-                -82,
-                0
-            ]
-        }
+        "platform_offset": [ 0, -82, 0]
     },
 
     "overrides": {

resources/definitions/bq_hephestos_2.def.json

@@ -9,7 +9,7 @@
         "manufacturer": "BQ",
         "category": "Other",
         "platform": "bq_hephestos_2_platform.stl",
-        "platform_offset": { "value": [6, 1320, 0 ] },
+        "platform_offset": [6, 1320, 0 ],
         "file_formats": "text/x-gcode"
     },
 

resources/definitions/bq_hephestos_xl.def.json

@@ -10,12 +10,7 @@
         "category": "Other",
         "file_formats": "text/x-code",
         "platform": "bq_hephestos_platform.stl",
-        "platform_offset": {
-            "value": [
-                0,
-                -82,
-                0
-            ]
+        "platform_offset": [ 0, -82, 0]
         }
     },
 

resources/definitions/bq_witbox.def.json

@@ -10,13 +10,7 @@
         "category": "Other",
         "file_formats": "text/x-gcode",
         "platform": "bq_witbox_platform.stl",
-        "platform_offset": {
-            "value": [
-                0,
-                -145,
-                -38
-            ]
-        }
+        "platform_offset": [ 0, -145, -38]
     },
 
     "overrides": {