Change #include style

Header files are now always included with their path from the
project's root directory rather than the path relative to
the includer.

Change-Id: If39b8510eef8da00baf5fe88337c45dbdf8c766e
Refs: #3084
diff --git a/tests/unit/util/log-filter-module.cpp b/tests/unit/util/log-filter-module.cpp
index cf3b628..ab55728 100644
--- a/tests/unit/util/log-filter-module.cpp
+++ b/tests/unit/util/log-filter-module.cpp
@@ -19,7 +19,7 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
-#include "util/logger.hpp"
+#include "ndn-cxx/util/logger.hpp"
 
 NDN_LOG_INIT(fm.FilterModule);