add another file which was missing in the previous commit

settings/ajax/togglesubadmins.php

+<?php
+
+// Init owncloud
+require_once('../../lib/base.php');
+
+OC_JSON::checkAdminUser();
+OCP\JSON::callCheck();
+
+$success = true;
+$error = "add user to";
+$action = "add";
+
+$username = $_POST["username"];
+$group = OC_Util::sanitizeHTML($_POST["group"]);
+
+// Toggle group
+if(OC_SubAdmin::isSubAdminofGroup($username, $group)){
+	OC_SubAdmin::deleteSubAdmin($username, $group);
+}else{
+	OC_SubAdmin::createSubAdmin($username, $group);
+}
+
+OC_JSON::success();
\ No newline at end of file