Change category of AVAudioSession

[blurtime]

Just a small suggestion: I found that the .ambient audio session category sometimes only played the video's audio at a much lower volume - in some cases, I couldn't hear anything at all. Therefore, I'd suggest changing it to .playback since that's the safer way to have audio. Really like the pod (and the examples), thank you!

[jonandersen]

Thanks @blurtime that makes a lot more sense to do!