Request: return to listening state after trigger_tts_stop

[flokstra]

Would it be possible to re-enter the listening state after tts audio stopped playing? In this way I don't have to use the wakeword every time I need to clarify or add to a request. If in that second (or third, or fourth,...) request no speech is detected, it can go back to the waiting for wakeword state.

[emmaconnor]

My pull request adds this feature

[flokstra]

Very nice! Thank you!