broadcaster: Confirm resume request when already streaming

Ensure resume callback sends confirmation when a broadcast is in
streaming state during resume.

Bug: 378564463
Bug: 347204335
Flag: com.android.bluetooth.flags.leaudio_big_depends_on_audio_state
Test: atest bluetooth_test_broadcaster
Change-Id: I6a041e2af7bcaabc8709c0fd742695448111355a