Updated type of file set in media_content_id for playing response

[witold-gren]

If I try use Apple HomePod mini they completely not work when we use url key with mp3 file path. When I updated this configuration to use media_id then it start working.

[homeassistant.components.apple_tv.media_player] Media streaming is not possible with current configuration

I think this change should work on other devices as well. If this is a problem, it would be great to add an additional configuration allowing you to choose what file is sent to the audio device to play the sound.