fix: ensure ducking is audio focus is sent always send when speek is called multiple times

[freeboub]

if you enable duck option and call mulitple times speek function. AUDIO_DUCK is send only once on the first call. To ensure AUDIO_DUCK is always call, move the event when tts start speeking

[freeboub]

If you need I can open a related ticket to explain better the issue and for better tracking.