Scripts; Import Special; HTML Widget; Can now update the currently loaded HTML Widget without having to select it from the import list

When importing a system-supplied HTML Widget, and the User already has a saved Script which is system-supplied (even if modified), they will now be prompted if they want to automatically update the Script with the latest system-supplied version. This prevents the need to manually select the HTML Widget from the list if they are replacing the loaded Script with an updated version of the same one.