changing prepared screen logic; DeletePreparedScreens will be done

automatically

stepmania/src/Screen.cpp

@@ -175,7 +175,6 @@ void Screen::HandleScreenMessage( const ScreenMessage SM )
 			SCREENMAN->SetNewScreen( NEXT_SCREEN );
 		break;
 	case SM_GoToPrevScreen:
-		SCREENMAN->DeletePreparedScreens();
 		if( SCREENMAN->IsStackedScreen(this) )
 			SCREENMAN->PopTopScreen( SM_None );
 		else

stepmania/src/ScreenGameplayMultiplayer.cpp

@@ -603,7 +603,6 @@ void ScreenGameplayMultiplayer::HandleScreenMessage( const ScreenMessage SM )
 
 		GAMESTATE->CancelStage();
 
-		SCREENMAN->DeletePreparedScreens();
 		SCREENMAN->PostMessageToTopScreen( SM_GoToPrevScreen, 0 );
 	}
 	else if( SM == SM_GoToStateAfterCleared )