Dispatch volume key event when mHandleVolumeKeysInWM is set

When mHandleVolumeKeysInWM is set, interceptKeyBeforeQueueing should not
swallow the volume key events when ringer is running.

Instead, in Automotive case, all volume key events would be dispatched
to CarAudioService and it's up to CarAudioService how to handle and
route the events.

Bug: 80155078
Test: manual test on Mojave carkit
Change-Id: Ia5e247ffcd5b30672e260a12cb95827d05232631