interest: declare default CanBePrefix setting

refs #4581

Change-Id: I82de3b13c3010242fa7999a2564d4a5442dfd14b
diff --git a/src/util/notification-subscriber.cpp b/src/util/notification-subscriber.cpp
index e69800a..f72aa58 100644
--- a/src/util/notification-subscriber.cpp
+++ b/src/util/notification-subscriber.cpp
@@ -79,6 +79,7 @@
     return;
 
   auto interest = make_shared<Interest>(m_prefix);
+  interest->setCanBePrefix(true);
   interest->setMustBeFresh(true);
   interest->setChildSelector(1);
   interest->setInterestLifetime(getInterestLifetime());
@@ -101,6 +102,7 @@
   nextName.appendSequenceNumber(m_lastSequenceNo + 1);
 
   auto interest = make_shared<Interest>(nextName);
+  interest->setCanBePrefix(false);
   interest->setInterestLifetime(getInterestLifetime());
 
   m_lastInterestId = m_face.expressInterest(*interest,