No mute state in volume context changes on abs devices

Since we are not muting the external audio device when ADJUST_MUTE is
called we should not change the volume based on the mute state in the
volume context switch callback

Test: manual
Bug: 399278432
Flag: EXEMPT bugfix
Change-Id: I4a9e5b24219b2cb551be4bb26a171312952f7f36