Fix sorting [skip ci]

resources/twig/list/bills.twig

@@ -1,4 +1,5 @@
 <table class="table table-bordered table-striped sortable">
+    <thead>
     <tr>
         <th data-defaultsort="disabled">&nbsp;</th>
         <th>Name</th>
@@ -10,7 +11,8 @@
         <th>Will be automatched</th>
         <th>Repeats every</th>
         <th data-defaultsort="disabled">&nbsp;</th>
-    </tr>
+    </tr></thead>
+    <tbody>
     {% for entry in bills %}
     <tr>
         <td>
@@ -81,4 +83,5 @@
     </tr>
 
     {% endfor %}
+    </tbody>
 </table>