Add 3mf meshes for mono extruder disco printers

resources/definitions/dagoma_discoeasy200.def.json

@@ -7,8 +7,8 @@
         "author": "Dagoma",
         "manufacturer": "Dagoma",
         "file_formats": "text/x-gcode",
-        "platform": "dagoma_discoeasy200.stl",
-        "platform_offset": [0, -28.5, 17],
+        "platform": "dagoma_discoeasy200.3mf",
+        "platform_offset": [0, -57, -39],
         "has_machine_quality": true,
         "has_materials": true,
         "preferred_material": "chromatik_pla",

resources/definitions/dagoma_discoultimate.def.json

@@ -7,7 +7,7 @@
         "author": "Dagoma",
         "manufacturer": "Dagoma",
         "file_formats": "text/x-gcode",
-        "platform": "dagoma_discoultimate.stl",
+        "platform": "dagoma_discoultimate.3mf",
         "platform_offset": [0, -29.1, 18],
         "has_machine_quality": true,
         "has_materials": true,