audio: Cleanup the signals we connect in the scanner
audio: Cleanup the signals we connect in the scanner

Without this fix we simply crash due to using up all the available FDs on the
system.

kingosticks/mopidy,vrs01/mopidy,kingosticks/mopidy,mokieyue/mopidy,tkem/mopidy,mokieyue/mopidy,vrs01/mopidy,tkem/mopidy,jcass77/mopidy,jcass77/mopidy,adamcik/mopidy,jodal/mopidy,mokieyue/mopidy,jodal/mopidy,mopidy/mopidy,kingosticks/mopidy,jodal/mopidy,vrs01/mopidy,ZenithDK/mopidy,adamcik/mopidy,mokieyue/mopidy,vrs01/mopidy,adamcik/mopidy,mopidy/mopidy,mopidy/mopidy,ZenithDK/mopidy,tkem/mopidy,tkem/mopidy,ZenithDK/mopidy,jcass77/mopidy,ZenithDK/mopidy