Ensure internal mute when switching to BLE broadcast

Since the BLE broadcast devices have an exception when computing the
absolute volume final attenuation we do not perform the absolute
adjustment when muting internally after a device switch.

Test: switch to ble broadcast and back
Bug: 404137311
Flag: EXEMPT bugfix
Change-Id: I4a763bbae30a8a844eb8b6e1112f0b5bd14284ea