Don't override the setting version

It should get inherited from fdmprinter or fdmextruder.

Found during work on CURA-8510.

resources/definitions/blv_mgn_cube_300.def.json

@@ -4,7 +4,6 @@
   "inherits": "blv_mgn_cube_base",
   "metadata": {
     "visible": true,
-    "setting_version": 17,
     "author": "wolfgangmauer",
     "manufacturer": "BLV",
     "file_formats": "text/x-gcode",

resources/definitions/blv_mgn_cube_350.def.json

@@ -4,7 +4,6 @@
   "inherits": "blv_mgn_cube_base",
   "metadata": {
     "visible": true,
-    "setting_version": 17,
     "author": "wolfgangmauer",
     "manufacturer": "BLV",
     "file_formats": "text/x-gcode",