[YouTube] Handle Web Safari formats

From yt-dlp/yt-dlp#14168, thx bashonly.

youtube_dl/extractor/youtube.py

@@ -2540,6 +2540,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             if f.get('source_preference') is None:
                 f['source_preference'] = -1
 
+            # Deprioritize since its pre-merged m3u8 formats may have lower quality audio streams
+            if client_name == 'web_safari' and proto == 'hls' and not is_live:
+                f['source_preference'] -= 1
+
             if itag in ('616', '235'):
                 f['format_note'] = join_nonempty(f.get('format_note'), 'Premium', delim=' ')
                 f['source_preference'] += 100