fix /issues/2592: web: Use Unicode paths to send files on Windows under Python 2
fix /issues/2592: web: Use Unicode paths to send files on Windows under Python 2

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