playlist: Work around Windows' Mandatory File Locking on playlist updates
playlist: Work around Windows' Mandatory File Locking on playlist updates

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