Manual function stores FID numbers in config unnecessarily

When using the manual delete function at /admin/config/content/fancy_file_delete/manual, the FID numbers entered into the field are saved in config when the form is submitted. This results in a diff each time drush cex is ran.

Unless I'm misunderstanding something, it seems like these config-related lines could be removed from FancyFileDeleteManual.php's submitForm() method. The class doesn't use config at all and this would prevent the input from being saved upon each use.

    $config = $this->config('fancy_file_delete.settings');

    foreach (Element::children($form) as $variable) {
      $config->set($variable, $form_state->getValue($form[$variable]['#parents']));
    }
    $config->save();