D8_rplf/modules/colorbox_load/colorbox_load.install

<?php

/**
 * @file
 * Colorbox load file.
 */

/**
 * Implements hook_install().
 */
function colorbox_load_install() {
  $config = \Drupal::configFactory()->getEditable('ng_lightbox.settings');
  $config->set('renderer', 'drupal_colorbox');
  $config->save();
}

/**
 * Implements hook_uninstall().
 */
function colorbox_load_uninstall() {
  $config = \Drupal::configFactory()->getEditable('ng_lightbox.settings');
  $config->set('renderer', NULL);
  $config->save();
}