Album-level tags were ordered by frequency and then alphabetically by value.
Album.Genre is just the first genre in that list, so any album whose genres tie
on frequency, which is the normal case, displayed the alphabetically first genre
rather than the first one in the file. A file tagged
"Native American New Age; Indigenous American Traditional Music; Ambient"
showed up as "Ambient".
Break frequency ties on order of appearance instead. This affects all
album-level tags, so mood tagged "Happy; Chill" now keeps that order too.
MediaFiles.ToAlbum already sorts the files by path before flattening their tags,
so the aggregated order stays deterministic across scans.
Only album genre was affected; media_file tags already preserved file order.
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