LeAudio: Fix audio modes priority

GAME mode is for local audio sources and should not take
over when bidirectional scenarios like LIVE if it is currently
used. Bidirectional scenarios should be prioritized to make
sure that the voiceback channel won't be closed.
This also adds the missing SOUNDEFFECTS entry.

Bug: 229041682
Test: start recording (LIVE mode), then trigger GAME mode, should stay in LIVE mode
Change-Id: I3662cb9eb76ad6dfab04764e41ec03620a048801