WindowServer: Factor out config sync check to sync_config_to_disk()

Author: https://github.com/MacDue
Commit: 2a49b58269
Pull-request: https://github.com/SerenityOS/serenity/pull/14185
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/tomuta

Userland/Services/WindowServer/WindowManager.h

@@ -354,6 +354,8 @@ private:
 
     void do_move_to_front(Window&, bool, bool);
 
+    bool sync_config_to_disk();
+
     [[nodiscard]] static WindowStack& get_rendering_window_stacks(WindowStack*&);
 
     RefPtr<Cursor> m_hidden_cursor;