Bugfix: skirt and brim were not recalculated when objects where just moved in plater

xs/xsp/Print.xsp

@@ -74,7 +74,8 @@ _constant()
     void set_shifted_copies(Points value)
         %code%{ THIS->_shifted_copies = value; %};
 
-    void set_copies(Points copies);
+    bool set_copies(Points copies);
+    bool reload_model_instances();
     void set_layer_height_ranges(t_layer_height_ranges layer_height_ranges)
         %code%{ THIS->layer_height_ranges = layer_height_ranges; %};