Save profile name used

- Save the profile name in global config
- Read the profile name when reading the global config

src/frontend_common/config.h

@@ -51,7 +51,6 @@ protected:
     [[nodiscard]] bool IsCustomConfig() const;
 
     void Reload();
-    void Save();
 
     /**
      * Derived config classes must implement this so they can reload all platform-specific