JSON fix: no initial layer temperature commands for the UM2 family (CURA-2781, CURA-2736)

resources/definitions/ultimaker2.def.json

@@ -89,9 +89,15 @@
         "material_print_temperature": {
             "enabled": "not (material_flow_dependent_temperature) and machine_gcode_flavor != \"UltiGCode\""
         },
+        "material_print_temperature_layer_0": {
+            "enabled": "machine_gcode_flavor != \"UltiGCode\""
+        },
         "material_bed_temperature": {
             "enabled": "machine_heated_bed and machine_gcode_flavor != \"UltiGCode\""
         },
+        "material_bed_temperature_layer_0": {
+            "enabled": "machine_heated_bed and machine_gcode_flavor != \"UltiGCode\""
+        },
         "machine_max_feedrate_x": {
             "default_value": 300
         },