Disable absolute volume behavior on standby

Currently, AbsoluteVolumeAudioStatusAction is always removed on Standby,
but we do not always switch away from absolute volume behavior.

AVB is usually disabled on standby when System Audio Mode is disabled.
However, some soundbars don't do this, creating a situation where AVB is
enabled but no AbsoluteVolumeAudioStatusAction exists. This prevents
AudioService from receiving volume changes and displaying UI.

This CL fixes the issue by ensuring that AVB is always disabled when
AbsoluteVolumeAudioStatusAction is removed. It should no longer be
possible to have AVB enabled without the action existing.

Bug: 312381205
Test: atest TvToAudioSystemArcAvbTest#avbEnabled_standby_avbDisabled

Change-Id: Ib430b1f2f7a0683551d424084d1b038c2d23913f