Remove config change hook that deletes link shares (#26612)

Seems broken. But also if link shares are not allowed, the link shares
will continue to exist but will be denied.

A future cleanup could be done through a background job.

apps/files_sharing/lib/Helper.php

@@ -39,7 +39,6 @@ class Helper {
 	public static function registerHooks() {
 		\OCP\Util::connectHook('OC_Filesystem', 'post_rename', '\OCA\Files_Sharing\Updater', 'renameHook');
 		\OCP\Util::connectHook('OC_Filesystem', 'post_delete', '\OCA\Files_Sharing\Hooks', 'unshareChildren');
-		\OCP\Util::connectHook('OC_Appconfig', 'post_set_value', '\OCA\Files_Sharing\Maintainer', 'configChangeHook');
 
 		\OCP\Util::connectHook('OC_User', 'post_deleteUser', '\OCA\Files_Sharing\Hooks', 'deleteUser');
 	}

apps/files_sharing/lib/Maintainer.php

-<?php
-/**
- * @author Morris Jobke <hey@morrisjobke.de>
- * @author Robin McCorkell <robin@mccorkell.me.uk>
- * @author Roeland Jago Douma <rullzer@owncloud.com>
- *
- * @copyright Copyright (c) 2016, ownCloud GmbH.
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License, version 3,
- * along with this program.  If not, see <http://www.gnu.org/licenses/>
- *
- */
-
-namespace OCA\Files_Sharing;
-
-/**
- * Maintains stuff around the sharing functionality
- *
- * for example: on disable of "allow links" it removes all link shares
- */
-
-class Maintainer {
-
-	/**
-	 * Keeps track of the "allow links" config setting
-	 * and removes all link shares if the config option is set to "no"
-	 *
-	 * @param array $params array with app, key, value as named values
-	 */
-	static public function configChangeHook($params) {
-		if($params['app'] === 'core' && $params['key'] === 'shareapi_allow_links' && $params['value'] === 'no') {
-			\OCP\Share::removeAllLinkShares();
-		}
-	}
-
-}