droid-sink: use UI volume for voice volume
Fixes voice volume control on e.g. FP4 and perhaps a few others.
Fixes: ubports/porting/reference-device-ports/android11/fairphone-4/fairphone-fp4#9 (closed)
Fixes voice volume control on e.g. FP4 and perhaps a few others.
Fixes: ubports/porting/reference-device-ports/android11/fairphone-4/fairphone-fp4#9 (closed)