Fix DLNA clients displaying wrong album art. #2903
Merged
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This addresses an issue where DLNA clients (VLC, Foobar) display incorrect album art for some music albums. Specifically albums that don't have folder/cover image file (i.e. a folder of mp3's) "steal" cover image from a different album, typically whichever appears first in the list.
For example, in the below folder structure, the first folder contains a folder.jpg file, but second doesn't. When viewed in VLC both albums show the image from the first folder.
Music/jazz
├── Bill Evans - Bill Evans Trio with Symphony Orchestra
│ ├── 01 - Granadas.flac
│ ├── 02 - Valse.flac
│ └── folder.jpg
└── David Chesky - Jazz In The New Harmonic
├── 01-Jazz in the New Harmonic.flac
└── 08-Transcendental Tripping.flac