fixed acl tests

failed because of the rename of auth_basic

_test/tests/inc/auth_aclcheck_caseinsensitive.test.php

 <?php
 
-class auth_acl_caseinsensitive_auth extends auth_basic {
+class auth_acl_caseinsensitive_auth extends DokuWiki_Auth_Plugin {
     function isCaseSensitive() {
         return false;
     }