[yandex music] Fix yandexmusic.py #26449 (thanks @Geograph-us)

https://github.com/ytdl-org/youtube-dl/issues/26449#issuecomment-700863588

youtube_dl/extractor/yandexmusic.py

@@ -109,8 +109,8 @@ class YandexMusicTrackIE(YandexMusicBaseIE):
             'Downloading track location JSON',
             query={'format': 'json'})
         key = hashlib.md5(('XGRlBW9FXlekgbPrRHuSiA' + fd_data['path'][1:] + fd_data['s']).encode('utf-8')).hexdigest()
-        storage = track['storageDir'].split('.')
-        f_url = 'http://%s/get-mp3/%s/%s?track-id=%s ' % (fd_data['host'], key, fd_data['ts'] + fd_data['path'], storage[1])
+        storage = track['realId']
+        f_url = 'http://%s/get-mp3/%s/%s?track-id=%s ' % (fd_data['host'], key, fd_data['ts'] + fd_data['path'], storage)
 
         thumbnail = None
         cover_uri = track.get('albums', [{}])[0].get('coverUri')