Fix TTS

[Alex9779]

I was playing with this integration and TTS and found there were errors using it because the URI for the cached TTS file was not resolved properly. This is a quick hack to fix it mostly taken from here. No idea if this fits any coding guidelines, that's why I just created it as a draft.

After fixing I played with an automation creating a snapshot then play the TTS, wait a moment and then restore. It seems the speaker has a problem returning the sound of the previous item, the player shows it is playing but it is quiet for a while until sound returns, no idea what the cause of that is or if it is fixable.