NES: Fix mapper 121, 187's CHR A18 behavior#181
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According to SF-Human, NewRisingSun in discord, those mappers shouldn't care about MMC3's alternate CHR banking mode. PPU A12 is directly wired to CHR-A18, resulting PPU $0000-$0FFF to always use the top 256K, and PPU $1000-$1FFF to always use the bottom 256K, regardless of $8000.7 bit.