update ForwardingHint format

refs #5187

Change-Id: Ib42cfca32933b63da2683d129293f92186bbb637
diff --git a/src/mgmt/management-tool.cpp b/src/mgmt/management-tool.cpp
index 6d34997..02299c9 100644
--- a/src/mgmt/management-tool.cpp
+++ b/src/mgmt/management-tool.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2020, Regents of the University of California.
+ * Copyright (c) 2014-2022, Regents of the University of California.
  *
  * This file is part of NDNS (Named Data Networking Domain Name Service).
  * See AUTHORS.md for complete list of NDNS authors and contributors.
@@ -475,11 +475,8 @@
           }
           else {
             Link link(rrset.getData());
-            const DelegationList& ds = link.getDelegationList();
-            for (const auto& i: ds) {
-              std::string str = std::to_string(i.preference);
-                + "," + i.name.toUri() + ";";
-              os << str;
+            for (const auto& delegation : link.getDelegationList()) {
+              os << delegation << ";";
             }
           }
           os << std::endl;