Fix PSPMsgDialog::Abort

Should better than #5284
Fix #2508

Should match JPCSP trace log
PPSSPP (my change)Log:
https://gist.github.com/sum2012/1aebc147a25a4230b3b4

JPCSP trace log:
https://gist.github.com/sum2012/3b6d614e76f655de3311