PICARD-636: use a better example VA release for tag preview

Use track 2.5 from http://musicbrainz.org/release/4b50c71e-0a07-46ac-82e4-cb85dc0c9bdd as suggested by KRSCuan.

http://tickets.musicbrainz.org/browse/PICARD-636
> This is per medium and is 13 on this track.
> ~multiartist should be added as well

Fixed in  909c7dc