Bind Top Surface Skin Layers value to Top Surface Skin Extruder

CURA-5563

Otherwise, if you set the layers to 2 for extruder 1 and use extruder 2
for Top Surface Skin, it will use the Top Surface Skin Layers value from
extruder 2, which is most likely 0, and no top surface skin layers will
be printed.

resources/definitions/fdmprinter.def.json

@@ -1074,7 +1074,7 @@
                     "maximum_value_warning": "top_layers - 1",
                     "type": "int",
                     "value": "0",
-                    "limit_to_extruder": "roofing_extruder_nr",
+                    "limit_to_extruder": "top_bottom_extruder_nr",
                     "settable_per_mesh": true,
                     "enabled": "top_layers > 0"
                 },