Apply a very specific hack for Danganronpa.

This should allow playing at non-1x resolutions, and without slowing down
the entire game just for one small framebuffer.

Generally, hacks are a bad thing.  But even with memcpy and block transfer
stuff, we'll never be able to solve this game without some sort of hack.
Detecting memory reads will complicate cross-platform compat or slow
things down.
Merge pull request #6145 from unknownbrackets/danganronpa-hack

Apply a very specific hack for Danganronpa