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games/dmid: add control 00h, bank select

akai mpk mini 2 and similar midi pianos: this is a nice
way to select opl3 banks 0-127 using a knob, while the
pads are mapped to percussions on channel 9

--- a/sys/src/games/dmid.c

+++ b/sys/src/games/dmid.c

@@ -413,13 +413,13 @@

 	case 0xb:

 		m = get8(x);

 		switch(n){

-		case 0x00: case 0x01: case 0x20: break;

+		case 0x00: if(m < Ninst) c->i = inst + m; break;

 		case 0x07: c->v = m; resetchan(c); break;

 		case 0x0a: c->pan = m < 32 ? 1<<4 : m > 96 ? 1<<5 : 3<<4; resetchan(c); break;

 		default: dprint("\nunknown controller %d", n);

 		}

 		break;

-	case 0xc: c->i = inst + n; break;

+	case 0xc: if(n < Ninst) c->i = inst + n; break;

 	case 0xe:

 		n = get8(x) << 7 | n;

 		c->bend = n - 0x4000 / 2;