fix compile failure when tools=no

scene/2d/visibility_notifier_2d.cpp

@@ -347,11 +347,11 @@ void VisibilityEnabler2D::_node_removed(Node* p_node) {
 }
 
 String VisibilityEnabler2D::get_configuration_warning() const {
-
+#ifdef TOOLS_ENABLED
 	if (is_inside_tree() && get_parent() && (get_parent()->get_filename()==String() && get_parent()!=get_tree()->get_edited_scene_root())) {
 		return TTR("VisibilityEnable2D works best when used with the edited scene root directly as parent.");
 	}
-
+#endif
 	return String();
 }