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games/snes: small mode 7 fix

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

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

@@ -366,8 +366,11 @@

 		if(p->msz != 1)

 			y -= y % p->msz;

 	}

-	if(n == 1 && (reg[MOSAIC] & 2) != 0)

-		p->msz = (reg[MOSAIC] >> 4) + 1;

+	if(n == 1)

+		if((reg[MOSAIC] & 2) != 0)

+			p->msz = (reg[MOSAIC] >> 4) + 1;

+		else

+			p->msz = 1;

 	if((m & 2) != 0)

 		y = 255 - y;

 	p->x = b7->x0 + ((m7[M7B] * y) & ~63);

@@ -412,12 +415,13 @@

 		if(++p->mx == p->msz)

 			p->mx = 0;

 	}

-	if(n == 1)

-		if((v & 0x80) != 0)

-			pixel(1, v & 0x7f, 0x71);

-		else

-			pixel(1, v, 0x11);

-	else

+	if(n == 1){

+		if((v & 0x7f) != 0)

+			if((v & 0x80) != 0)

+				pixel(1, v & 0x7f, 0x71);

+			else

+				pixel(1, v, 0x11);

+	}else if(v != 0)

 		pixel(0, v, 0x40);

 	if((m & 1) != 0){

 		p->x -= m7[M7A];