Only show support flow if support is enabled

resources/definitions/fdmprinter.def.json

@@ -2510,6 +2510,7 @@
                             "minimum_value": "5",
                             "minimum_value_warning": "50",
                             "maximum_value_warning": "150",
+                            "enabled": "support_enable",
                             "limit_to_extruder": "support_infill_extruder_nr",
                             "settable_per_mesh": false,
                             "settable_per_extruder": true