Rockbox

I know keymap changes can be a difficult topic, this one however is just a small change - which, I hope, improves usability of Clip players quite a bit.

I just swapped the behavior of two functions when browsing lists: short press on the power button returns to WPS, and pressing menu + center stops playback while in lists. Return to WPS is arguably the much more often used functionality of the two, and this change makes it easier to do that.