CURA-4481 Disable "Remove empty layers" when support is enabled.

When support is enabled then it doesn't matter if the user choose
whether to remove or not the empty layers, because it's done after
generating supports. In order to avoid confusion to the user, the
setting is disabled.

resources/definitions/fdmprinter.def.json

@@ -3980,6 +3980,7 @@
                     "description": "Remove empty layers beneath the first printed layer if they are present.",
                     "type": "bool",
                     "default_value": true,
+                    "enabled": "not support_enable",
                     "settable_per_mesh": false,
                     "settable_per_extruder": false
                 }