[Audiosharing] Fix hysteresis mode

Move add source logic from onReceiveStateChanged(BIS>0) to onSourceAdded

Test: atest
Bug: 355222285
Bug: 377658982
Flag: com.android.settingslib.flags.audio_sharing_hysteresis_mode_fix
Change-Id: I93db0422b028ec192a1ffea9545da4ee5c6d2e44
2 files changed