[nfo] remove unused variable
[music] ensure we grab the path of albums and artists before looking for .nfo files - fixes #14964
[music] set album/artist path at the top of the Show*Info() methods rather than inside it to save querying the path multiple times
[music] fix embedded thumbs going missing once you leave a directory. fixes #14637
Merge pull request #4368 from jmarshallnz/music_fixes

Music fixes for .nfo files