fix(opal_orchestra): Remove <filesystem> include

Signed-off-by: Philipp Jungkamp <philipp.jungkamp@rwth-aachen.de>

Author: pjungkamp

include/villas/nodes/opal_orchestra/ddf.hpp

@@ -8,7 +8,6 @@
 
 #pragma once
 
-#include <filesystem>
 #include <optional>
 #include <string>
 #include <unordered_map>