refactor(ui): Do not allow to overwrite FSD settings from connect page

Overwriting FSD settings from the connect page (instead of changing the
server settings itself) introduced some complexity in the UI. As
spontaniously changing the FSD settings is likely a VERY rare use-case
and to simplify the logic/UI, it should only be done from the server
settings itself.

src/blackgui/components/loginadvcomponent.h

@@ -61,9 +61,6 @@ namespace BlackGui::Components
         //! Login requested
         void toggleNetworkConnection();
 
-        //! Reset state
-        void resetState();
-
     signals:
         //! Login
         void loginOrLogoffSuccessful();