Sound don't work if disabled before starting a game

[TheDax]

Yes, it's supposed to only work when pressing Back in NewUI because it doesn't work immediately like the old UI. I can't change that part. Nice catches. As for pressing escape, the dialog returns cancel when pressing back(on the 360 pad)/escape/B/etc., so I'm not sure how to deal with that, meaning it discards whatever you changed. Pullrq coming which rectifies all of the above issues except the escape thing.

Also, if you enable Atrac 3+ after sound's been disabled in the first place, it won't kick in until the next time the game asks for some Atrac 3+ audio to be played(like say changing a level or entering a menu, whenever the game requests it). I'm not going to go to such an extent of reinitialising all of the sceAudio stuff just for that. If someone else wants to, they can. :\

https://github.com/hrydgard/ppsspp/pull/3169

Post here if there are still remaining issues aside from the ones I stated above.