Rebuild disallowed area when a limit_to_extruder_nr has been changed

CURA-4069

Trigger to rebuild the disallowed area when a limit to extruder feature
has been changed.

cura/BuildVolume.py

@@ -527,6 +527,10 @@ class BuildVolume(SceneNode):
             self._updateExtraZClearance()
             rebuild_me = True
 
+        if setting_key in self._limit_to_extruder_settings:
+            self._updateDisallowedAreas()
+            rebuild_me = True
+
         if rebuild_me:
             self.rebuild()
 
@@ -969,3 +973,4 @@ class BuildVolume(SceneNode):
     _ooze_shield_settings = ["ooze_shield_enabled", "ooze_shield_dist"]
     _distance_settings = ["infill_wipe_dist", "travel_avoid_distance", "support_offset", "support_enable", "travel_avoid_other_parts"]
     _extruder_settings = ["support_enable", "support_bottom_enable", "support_roof_enable", "support_infill_extruder_nr", "support_extruder_nr_layer_0", "support_bottom_extruder_nr", "support_roof_extruder_nr", "brim_line_count", "adhesion_extruder_nr", "adhesion_type"] #Settings that can affect which extruders are used.
+    _limit_to_extruder_settings = ["wall_extruder_nr", "wall_0_extruder_nr", "wall_x_extruder_nr", "top_bottom_extruder_nr", "infill_extruder_nr", "support_infill_extruder_nr", "support_extruder_nr_layer_0", "support_bottom_extruder_nr", "support_roof_extruder_nr", "adhesion_extruder_nr"]