Changed processing of a wxEVT_SYS_COLOUR_CHANGED event.

Only UI is updated. The application doesn't recreated now

src/slic3r/GUI/GUI_ObjectList.hpp

@@ -386,6 +386,7 @@ public:
     void paste_objects_into_list(const std::vector<size_t>& object_idxs);
 
     void msw_rescale();
+    void sys_color_changed();
 
     void update_after_undo_redo();
     //update printable state for item from objects model