[GOVCMSD7-156] Remove pathauto_persist module

[suhyeonh]

The module pathauto_persist has been merged into the Pathauto module hence no longer required in the distribution.

[pandaskii]

Also, We don't need this function while the modules are removed from the distribution

/**
 * Implements hook_paranoia_hide_modules().
 *
 * @TODO remove this after pathauto update.
 */
function govcms_paranoia_hide_modules() {
  return array(
    'pathauto_persist' => 'Other',
    'govcms_register' => 'govCMS',
  );
}