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games/nes: mmc3 chr inversion fixed

--- a/sys/src/games/nes/mem.c

+++ b/sys/src/games/nes/mem.c

@@ -281,7 +281,7 @@

 		prgb[2] = prg + (2 * nprg - 2) * 0x2000;

 	}

 	prgb[1] = prg + b[7] * 0x2000;

-	c = (m & 0x80) >> 6;

+	c = (m & 0x80) >> 5;

 	for(i = 0; i < 2; i++){

 		chrb[j = (i << 1) ^ c] = chr + (b[i] >> 1) * 0x800;

 		chrb[j+1] = chrb[j] + 0x400;