Trying to remove comment, lyrics or performer tags or the variant with description (comment:description etc.) fails for different cases in ID3, Vorbis, MP4 and Apev2 tags.
E.g. removing empty comment: or performer: for Vorbis and APEv2 fails, removing just "comment" fails for ID3, for MP4 freeform tags in general cannot be removed.
Add tests and fix problematic cases