Border requires closing tags

ForumPostPanel has been changed to extend Border rather than Panel and therefore requires a closing tag rather than a self-closing one.

view/src/main/java/se/su/dsv/scipro/reviewer/timeline/TimelinePanel.html

@@ -8,7 +8,7 @@
 <wicket:panel>
     <div class="d-flex flex-column-reverse pt-1">
         <wicket:container wicket:id="events">
-            <wicket:container wicket:id="event"/>
+            <wicket:container wicket:id="event"></wicket:container>
         </wicket:container>
     </div>
 </wicket:panel>