JSON fix: put material_print_temperature_layer_0 back to normal print temp for all machines other than UM3 family (CURA-3359)

resources/definitions/fdmprinter.def.json

@@ -1297,7 +1297,7 @@
                     "unit": "°C",
                     "type": "float",
                     "default_value": 215,
-                    "value": "material_print_temperature + 5",
+                    "value": "material_print_temperature",
                     "minimum_value": "-273.15",
                     "minimum_value_warning": "0",
                     "maximum_value_warning": "260",

resources/definitions/ultimaker3.def.json

@@ -106,6 +106,7 @@
         "line_width": { "value": "machine_nozzle_size * 0.875" },
         "machine_min_cool_heat_time_window": { "value": "15" },
         "default_material_print_temperature": { "value": "200" },
+        "material_print_temperature_layer_0": { "value": "material_print_temperature + 5" },
         "material_bed_temperature": { "maximum_value": "115" },
         "material_bed_temperature_layer_0": { "maximum_value": "115" },
         "material_standby_temperature": { "value": "100" },