aica: don't disable channel when reaching full attenuation

Some games rely on the channel still being processed and CA/LP being
updated. Courtesy of @kihato
Issues #472, #483, #1180, #1249, #1030 (partial)

core/hw/aica/sgc_if.cpp

@@ -1211,8 +1211,7 @@ void AegStep(ChannelEx* ch)
 		if (ch->AEG.GetValue() >= 0x3FF)
 		{
 			aeg_printf("[%d]AEG_step : EG_Release End @ %x", ch->ChannelNumber, ch->AEG.GetValue());
-			ch->AEG.SetValue(0x3FF); // TODO: mnn, should we do anything about it running wild ?
-			ch->disable(); // TODO: Is this ok here? It's a speed optimisation (since the channel is muted)
+			ch->AEG.SetValue(0x3FF);
 		}
 		break;
 	}