macosx: Fix audio library not updating when sort changes

Signed-off-by: Claudio Cambra <developer@claudiocambra.com>

modules/gui/macosx/library/VLCLibraryModel.m

@@ -512,7 +512,9 @@ static void libraryCallback(void *p_data, const vlc_ml_event_t *p_event)
     _cachedGenres = nil;
     _cachedArtists = nil;
     _cachedAudioMedia = nil;
+
     [_defaultNotificationCenter postNotificationName:VLCLibraryModelVideoMediaListUpdated object:nil];
+    [_defaultNotificationCenter postNotificationName:VLCLibraryModelAudioMediaListUpdated object:nil];
 }
 
 @end