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games/blit: update screen when display address changes (thanks aap)

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

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

@@ -161,7 +161,7 @@

 	case 01400012: uarttxbuf = (uchar) v; return;

 	case 01400024: return; /* mouse: purpose unknown */

 	case 01400026: return; /* mouse: purpose unknown */

-	case 01400030: daddr = ((daddr >> 2) & ~m | v & m) << 2; return;

+	case 01400030: daddr = ((daddr >> 2) & ~m | v & m) << 2; updated = Rect(0, 0, SX, SY); return;

 	case 01400040: dstat = dstat & ~m | v & m; invert = -(dstat & 1); updated = Rect(0, 0, SX, SY); return;

 	case 01400056: /* sound; exact function unknown */ return;

 	case 01400060: kbdctrl = v; return;