if banner caching is disabled, don't waste time on load

stepmania/src/BannerCache.cpp

@@ -275,6 +275,9 @@ static inline int closest( int num, int n1, int n2 )
  * if the memory or settings change. */
 void BannerCache::CacheBanner( CString BannerPath )
 {
+	if( PREFSMAN->m_BannerCache != PrefsManager::BNCACHE_LOW_RES )
+		return;
+
 	CHECKPOINT_M( BannerPath );
 	if( !DoesFileExist(BannerPath) )
 		return;