copy the current config when creating a pre-game config

I don't care either way but I guess this makes it more practical, because you can reset to defaults but you can't copy any other way (except for copy/pasting the *.ini files).
It does not require restart for things that don't require restart, since it calls a load here: https://github.com/hrydgard/ppsspp/pull/7195/files#diff-0319254777e353e315f24a35b7a8430aL1067