gigya_field_formatter_settings_form token_list cannot be altered before rendering

The gigya_field_formatter_settings_form in /includes/gigya_field_inc on line 285 uses:

$form['tokens_list'] = array(
  '#markup' => theme('token_tree', array('token_types' => array('node'), 'global_types' => FALSE)),
  '#suffix' => '</div>',
);

to output the token tree, which doesn't allow other modules to alter this form element before the token tree is rendered. The proposed solution would be to use:

$form['tokens_list'] = array(
  '#theme' => 'token_tree',
  '#token_types' => array('node'),
  '#global_types' => FALSE,
  '#suffix' => '</div>',
);