mpd: Fix flake8 warning
mpd: Fix flake8 warning

mopidy/mopidy,swak/mopidy,jodal/mopidy,swak/mopidy,hkariti/mopidy,ali/mopidy,pacificIT/mopidy,glogiotatidis/mopidy,mokieyue/mopidy,vrs01/mopidy,mopidy/mopidy,ali/mopidy,quartz55/mopidy,jcass77/mopidy,kingosticks/mopidy,bencevans/mopidy,hkariti/mopidy,diandiankan/mopidy,jmarsik/mopidy,tkem/mopidy,quartz55/mopidy,bacontext/mopidy,ali/mopidy,mokieyue/mopidy,dbrgn/mopidy,kingosticks/mopidy,bacontext/mopidy,tkem/mopidy,jcass77/mopidy,glogiotatidis/mopidy,mokieyue/mopidy,diandiankan/mopidy,ZenithDK/mopidy,pacificIT/mopidy,jcass77/mopidy,adamcik/mopidy,bencevans/mopidy,hkariti/mopidy,swak/mopidy,tkem/mopidy,hkariti/mopidy,adamcik/mopidy,SuperStarPL/mopidy,rawdlite/mopidy,mokieyue/mopidy,mopidy/mopidy,bacontext/mopidy,jodal/mopidy,SuperStarPL/mopidy,vrs01/mopidy,jmarsik/mopidy,vrs01/mopidy,ZenithDK/mopidy,SuperStarPL/mopidy,vrs01/mopidy,glogiotatidis/mopidy,kingosticks/mopidy,diandiankan/mopidy,swak/mopidy,quartz55/mopidy,glogiotatidis/mopidy,rawdlite/mopidy,bencevans/mopidy,diandiankan/mopidy,pacificIT/mopidy,ZenithDK/mopidy,pacificIT/mopidy,jodal/mopidy,ZenithDK/mopidy,dbrgn/mopidy,tkem/mopidy,ali/mopidy,rawdlite/mopidy,adamcik/mopidy,quartz55/mopidy,bacontext/mopidy,jmarsik/mopidy,dbrgn/mopidy,dbrgn/mopidy,bencevans/mopidy,SuperStarPL/mopidy,jmarsik/mopidy,rawdlite/mopidy