Uses mtu_discovery from conf.

FossilOrigin-Name: 4c2862448014c58dd00bf615409680368e6f8d3092bd0ee7dab262460a2e894a

src/wtp/wtp_interface.c

@@ -78,6 +78,7 @@ struct conn * get_conn()
 		if (conf_mtu){
 			conn->mtu=conf_mtu;
 		}
+		conn->mtu_discovery=conf_mtu_discovery;	
 	}
 	return conn;
 }