Add missing 'Album Artist' tag when its value is 'Various Artists'

Fixes #518.

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/common/program.py

@@ -440,7 +440,7 @@ def getTagList(self, number, mbdiscid):
         if number > 0:
             tags['MUSICBRAINZ_DISCID'] = mbdiscid
 
-        if self.metadata and not self.metadata.various:
+        if self.metadata:
             tags['ALBUMARTIST'] = releaseArtist
         tags['ARTIST'] = trackArtist
         tags['TITLE'] = title