Hook Brandish frame capture for menu fadeout and save screenshots.

This fixes fadeouts and save file screenshots getting outdated framebuffer data. I haven't tested extensively but from code analysis and a bit of playing it looks like it should be safe.
Since you're only hooking entry into the function (REPFLAG_HOOKENTER), the function will still run.  That means it's still going to copy these bytes, and it's being copied twice here.  Probably not a big deal, but might be a tiny bit slower than it could be.

-[Unknown]