Remove the debug only function.

Author: AndreaCatania

godot4/gd_scene_synchronizer.h

@@ -64,7 +64,9 @@ class GdSceneSynchronizer : public Node, public NS::SynchronizerManager {
 	virtual void on_init_synchronizer(bool p_was_generating_ids) override;
 	virtual void on_uninit_synchronizer() override;
 
+#ifdef DEBUG_ENABLED
 	virtual void debug_only_validate_objects() override;
+#endif
 
 	virtual void on_add_object_data(NS::ObjectData &p_object_data) override;