Simplify test

diff --git a/youtube-dl b/youtube-dl
index 0e7f5d6..2b08fab 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -3351,7 +3351,7 @@ class FFmpegExtractAudioPP(PostProcessor):
 
                more_opts = []
                if self._preferredcodec == 'best' or self._preferredcodec == filecodec:
-                       if filecodec == 'aac' or filecodec == 'mp3' or filecodec == 'vorbis':
+                       if filecodec in ['aac', 'mp3', 'vorbis']:
                                # Lossless if possible
                                acodec = 'copy'
                                extension = filecodec