PlayerBase: conditional muting on OP_PLAY_AUDIO changes

Do not mute based on OP_PLAY_AUDIO client side.
Disable legacy behavior with constant without affecting
  audio service logs.

Bug: 112339570
Test: enter DnD, play notifications, verify not heard
Change-Id: I8a963af02fc2b42844470a4212fec8e2f6a5e4e0