-fix sound room params (was not working)

-fixes to DAE exporter
-ios fixes (video)

scene/audio/sound_room_params.cpp

@@ -54,7 +54,7 @@ void SoundRoomParams::_notification(int p_what) {
 
 
 		case NOTIFICATION_ENTER_TREE: {
-#if 0
+//#if 0
 			Node *n=this;
 			Room *room_instance=NULL;
 			while(n) {
@@ -74,11 +74,11 @@ void SoundRoomParams::_notification(int p_what) {
 			if (room_instance) {
 				room=room_instance->get_sound_room();
 			} else {
-				room=get_scene()->get_default_world()->get_sound_space();
+				room=get_viewport()->find_world()->get_sound_space();
 			}
 
 			_update_sound_room();
-#endif
+//#endif
 
 		} break;
 		case NOTIFICATION_EXIT_TREE: {