Ignore the OSC code for desktop notifications

In Fedora, bash is configured to display a desktop notification when a command
finishes (and the terminal is not focused). weston-terminal complains about it;
let's silence it.

Signed-off-by: Dima Ryazanov <dima@gmail.com>
Acked-by: Daniel Stone <daniels@collabora.com>

clients/terminal.c

@@ -1298,6 +1298,8 @@ handle_osc(struct terminal *terminal)
 		break;
 	case 7: /* shell cwd as uri */
 		break;
+	case 777: /* Desktop notifications */
+		break;
 	default:
 		fprintf(stderr, "Unknown OSC escape code %d, text %s\n",
 			code, p);