Adjust includes for the updated locations of ndn-cxx security headers

Change-Id: Id1e44e929541fdd1132a4b3e6366404232351e68
diff --git a/tests/unit/clients/iterative-query-controller.cpp b/tests/unit/clients/iterative-query-controller.cpp
index 3f51baa..46d11d4 100644
--- a/tests/unit/clients/iterative-query-controller.cpp
+++ b/tests/unit/clients/iterative-query-controller.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018, Regents of the University of California.
+ * Copyright (c) 2014-2020, 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.
@@ -65,7 +65,7 @@
   ndn::util::DummyClientFace producerFace;
   ndn::util::DummyClientFace consumerFace;
 
-  unique_ptr<security::v2::Validator> validator;
+  unique_ptr<security::Validator> validator;
   ndns::NameServer top;
   ndns::NameServer net;
   ndns::NameServer ndnsim;