interest: remove deprecated setDefaultCanBePrefix()

Change-Id: Ifaffb7cc7772a31c3b396c60b816e783d70b7041
diff --git a/examples/consumer.cpp b/examples/consumer.cpp
index 6643812..f524962 100644
--- a/examples/consumer.cpp
+++ b/examples/consumer.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2021 Regents of the University of California.
+ * Copyright (c) 2013-2022 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -44,7 +44,6 @@
     interestName.appendVersion();
 
     Interest interest(interestName);
-    interest.setCanBePrefix(false);
     interest.setMustBeFresh(true);
     interest.setInterestLifetime(6_s); // The default is 4 seconds