fromfilename: fix dict view conversion for python3 (fix #2195)
fromfilename: fix dict view conversion for python3 (fix #2195)

dict.values() returns a view rather than a list in python3

Kraymer/beets,Kraymer/beets,artemutin/beets,jackwilsdon/beets,lengtche/beets,madmouser1/beets,sampsyo/beets,beetbox/beets,diego-plan9/beets,diego-plan9/beets,lengtche/beets,pkess/beets,lengtche/beets,SusannaMaria/beets,xsteadfastx/beets,madmouser1/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,beetbox/beets,pkess/beets,ibmibmibm/beets,sampsyo/beets,SusannaMaria/beets,diego-plan9/beets,sampsyo/beets,ibmibmibm/beets,madmouser1/beets,xsteadfastx/beets,ibmibmibm/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,Kraymer/beets,jackwilsdon/beets,shamangeorge/beets,MyTunesFreeMusic/privacy-policy,shamangeorge/beets,pkess/beets,mosesfistos1/beetbox,MyTunesFreeMusic/privacy-policy,madmouser1/beets,ibmibmibm/beets,jackwilsdon/beets,mosesfistos1/beetbox,artemutin/beets,pkess/beets,lengtche/beets,beetbox/beets,SusannaMaria/beets,Kraymer/beets,xsteadfastx/beets,diego-plan9/beets,artemutin/beets,SusannaMaria/beets,beetbox/beets,shamangeorge/beets,artemutin/beets,jackwilsdon/beets,sampsyo/beets,shamangeorge/beets,xsteadfastx/beets