Remove an unnecessarily include of main/ code from core/

Code in core/ generally should not depend on code from main/

This include was added in #41100 in order to call
`Main::is_project_manager()`.  The `is_project_manager()` check was
later removed in #52742 but this include was never cleaned up.

This clean-up is related to #108429.

core/string/translation_server.cpp

@@ -36,10 +36,6 @@
 #include "core/os/os.h"
 #include "core/string/locales.h"
 
-#ifdef TOOLS_ENABLED
-#include "main/main.h"
-#endif
-
 Vector<TranslationServer::LocaleScriptInfo> TranslationServer::locale_script_info;
 
 HashMap<String, String> TranslationServer::language_map;