refs #20530 [fid_adlr] Maintenance header

* fixes empty li and unclosed ul in header menu

themes/fid_adlr/templates/header.phtml

@@ -169,7 +169,6 @@
     <div class="collapse header-menu-collapse" id="submenu">
       <div class="submenu-collapse-wrapper">
       <ul class="submenu-collapse">
-        <li>
         <?php $searchOptions = $this->searchOptions("Solr"); ?>
         <?php if (!empty($advSearch = $searchOptions->getAdvancedSearchAction())): ?>
           <li>
@@ -196,7 +195,7 @@
         <li>
           <a href="<?= $this->config()->get('config')->RssConsumer['fallback_url'] ?? ""?>/service-fuer-fachreferate"><?=$this->translate('Services for subject specialists')?></a>
         </li>
-
+        </ul>
       </div>
     </div>
   </nav>