vifm: use mpv as default music player

.config/vifm/vifmrc

@@ -214,6 +214,8 @@ filextype *.svg
 
 " Audio
 filetype *.wav,*.mp3,*.flac,*.m4a,*.wma,*.ape,*.ac3,*.og[agx],*.spx,*.opus
+       \ {Play using mpv}
+       \ mpv %c,
        \ {Play using ffplay}
        \ ffplay -nodisp -autoexit %c,
        \ {Play using MPlayer}