Add heuristic for memory->framebuffer copies, fixing video flicker in Naruto UNH 2 #18008
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Fixes #17740
The game makes a copy of video data that we detect as being to a left-behind 16-bit framebuffer, overlapping the intended target. This makes a heuristic check for old framebuffers that are too small, and decides that it's probably not the right target.
Alternatively, we should simply copy to all overlapping buffers...
Actually, thinking of adding scoring here like in other cases of framebuffer matching, which would reduce the potential fallout in case some game accidentally relies on the old behavior. Might do that before merge.Done.