table: Make LRU the default CS replacement policy

Change-Id: I01fe000544da9df860437ffc8869bc6b20e844c0
refs: #4728
diff --git a/daemon/table/cs.cpp b/daemon/table/cs.cpp
index 1663d8f..85ef388 100644
--- a/daemon/table/cs.cpp
+++ b/daemon/table/cs.cpp
@@ -37,11 +37,10 @@
 
 NFD_LOG_INIT(ContentStore);
 
-unique_ptr<Policy>
+static unique_ptr<Policy>
 makeDefaultPolicy()
 {
-  const std::string DEFAULT_POLICY = "priority_fifo";
-  return Policy::create(DEFAULT_POLICY);
+  return Policy::create("lru");
 }
 
 Cs::Cs(size_t nMaxPackets)