entity_activity-8.x-1.0-beta13/modules/entity_activity_mail/entity_activity_mail.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Entity Activity Mail module.
 */

/**
 * Set a default value for the new settings "Mark as read log sent by mail".
 */
function entity_activity_mail_update_8101(&$sandbox) {
  $config_factory = \Drupal::configFactory();
  $settings = $config_factory->getEditable('entity_activity_mail.settings');
  $settings->set('general.mark_read', FALSE);
  $settings->save(TRUE);
}