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games/snes: reset oam address on vblank

--- a/sys/src/games/snes/ppu.c

+++ b/sys/src/games/snes/ppu.c

@@ -757,6 +757,7 @@

 			reg[RDNMI] |= VBLANK;

 			if((reg[NMITIMEN] & VBLANK) != 0)

 				nmi = 2;

+			oamaddr = reg[0x2102] << 1 | (reg[0x2103] & 1) << 9;

 			if((reg[NMITIMEN] & AUTOJOY) != 0){

 				memwrite(0x4016, 1);

 				memwrite(0x4016, 0);