cleanup: drop inclusion of unused filesystem header

The filesystem header is included and referenced but never used.

This is a leftover from before the filesystem calls where handled
through an interface.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I69e5ba22ea853b2582cf99b679e72d81f30ee74e
diff --git a/cleanup/cleanup.cpp b/cleanup/cleanup.cpp
index 201b9c8..278b079 100644
--- a/cleanup/cleanup.cpp
+++ b/cleanup/cleanup.cpp
@@ -18,7 +18,6 @@
 
 #include <blobs-ipmid/blobs.hpp>
 
-#include <filesystem>
 #include <memory>
 #include <string>
 #include <vector>
@@ -46,8 +45,6 @@
 bool FileCleanupHandler::commit(uint16_t session,
                                 const std::vector<uint8_t>& data)
 {
-    namespace fs = std::filesystem;
-
     for (const auto& file : files)
     {
         helper->remove(file);