Improve readability of plugins.sanitize_choices
Improve readability of plugins.sanitize_choices

shamangeorge/beets,jackwilsdon/beets,SusannaMaria/beets,sampsyo/beets,ibmibmibm/beets,jackwilsdon/beets,beetbox/beets,ibmibmibm/beets,beetbox/beets,jackwilsdon/beets,SusannaMaria/beets,ibmibmibm/beets,SusannaMaria/beets,shamangeorge/beets,sampsyo/beets,SusannaMaria/beets,shamangeorge/beets,sampsyo/beets,ibmibmibm/beets,beetbox/beets,beetbox/beets,shamangeorge/beets,jackwilsdon/beets,sampsyo/beets