LeAudioService: Ignore store of intents when LeAudioService is inactive

There is possibility that in test teardown an intent may come which will
be stored on device queue to parse in test. When there is no service,
this intent should be ignored.

Tag: #feature
Test: atest GoogleBluetoothInstrumentationTests:com.android.bluetooth.le_audio.LeAudioServiceTest#testDump_doesNotCrash -- --abi x86_64
Bug: 299431664
Change-Id: I0f2ca423c80150920e27d67a55ade2e0eb33af0b