If the RMB is bound to a cancel key, don't show the info menu.

This fixes a small bug where if the user has the right mouse button bound to a cancel key, it still shows a game's "info menu" anyway, regardless of the comment.

https://github.com/hrydgard/ppsspp/commit/8f98fa78aa759f77dcca43c1daf18fc3a203c9a0#commitcomment-5234565