Only UpdateMeterSort when necessary (when sorting), account for other games and styles.

Songs are already sorted by title so no need to do so again (otherwise big boi lag)

src/StepMania.cpp

@@ -1006,7 +1006,6 @@ int sm_main(int argc, char* argv[])
 	UNLOCKMAN	= new UnlockManager;
 	SONGMAN->UpdatePopular();
 	SONGMAN->UpdatePreferredSort();
-	SONGMAN->UpdateMeterSort();
 	NETWORK		= new NetworkManager;
 	STATSMAN	= new StatsManager;