Fixed non debug build compilation 2.

Author: AndreaCatania

core/scene_synchronizer_debugger.h

@@ -5,11 +5,12 @@
 #include "core/string/ustring.h"
 
 #include "core.h"
-#include "json.hpp"
 #include <string>
 
 #endif
 
+#include "json.hpp"
+
 namespace NS {
 class SceneSynchronizerBase;
 };