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games/gb: when the LCD is turned off, reset ppuy and ppustate to 0, fixes bug in dragon warriors iii reported by mischief

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

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

@@ -107,8 +107,11 @@

 		break;

 	case LCDC:

 		ppusync();

-		if((~v & reg[a] & LCDEN) != 0)

+		if((~v & reg[a] & LCDEN) != 0){

+			ppuy = 0;

+			ppustate = 0;

 			delevent(&evhblank);

+		}

 		if((v & ~reg[a] & LCDEN) != 0)

 			addevent(&evhblank, 456*2);

 		break;