OpenXR: Fix hiding/showing composition layers using hole punching

(cherry picked from commit d9ad5d1cd42bf5aedeb9e0a407a4dfe4bdff07d9)

modules/openxr/scene/openxr_composition_layer.cpp

@@ -342,7 +342,7 @@ void OpenXRCompositionLayer::_notification(int p_what) {
 			}
 		} break;
 		case NOTIFICATION_VISIBILITY_CHANGED: {
-			if (!fallback && openxr_session_running && is_inside_tree()) {
+			if (is_natively_supported() && openxr_session_running && is_inside_tree()) {
 				if (layer_viewport && is_visible()) {
 					openxr_layer_provider->set_viewport(layer_viewport->get_viewport_rid(), layer_viewport->get_size());
 				} else {