Replace a too-simple heuristic with a compat flag, fixing Castlevania flicker. #18013
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Should fix the flicker in Castlevania: Symphony of the Night.
Fixes #17517
The heuristic from #16971 worked for Rainbow Six but broke Castlevania, so I'd rather use a compat flag instead of breaking a different game until we can find a more reliable heuristic for Rainbow Six.