interest: declare default CanBePrefix setting

refs #4581

Change-Id: I82de3b13c3010242fa7999a2564d4a5442dfd14b
diff --git a/tests/unit-tests/mgmt/dispatcher.t.cpp b/tests/unit-tests/mgmt/dispatcher.t.cpp
index 69f389d..c75af4d 100644
--- a/tests/unit-tests/mgmt/dispatcher.t.cpp
+++ b/tests/unit-tests/mgmt/dispatcher.t.cpp
@@ -361,7 +361,7 @@
 
   face.sentData.clear();
 
-  auto interestSmall = *makeInterest("/root/test/small/valid");
+  auto interestSmall = *makeInterest("/root/test/small/valid", true);
   face.receive(interestSmall);
   advanceClocks(1_ms, 10);