message: Fix compl warn in agent integration test.
diff: @@ -263,7 +263,7 @@ mod medium_cases {
  let wallet_handle = WalletUtils::create_and_open_wallet("pool9", "wallet9", "default").unwrap();
  let (did, ver_key, pub_key): (String, String, String) = SignusUtils::create_and_store_my_did(wallet_handle, None).unwrap();
  let endpoint = "tcp://127.0.0.1:9709";
  - let listener_handle = AgentUtils::listen(wallet_handle, endpoint, None,
  + AgentUtils::listen(wallet_handle, endpoint, None,
  Some(Box::new(move |_, msg| {
  wait_msg_from_cli_send.send(msg).unwrap();
  }))).unwrap();
  