Replace div with li for webstandards

Author: Kevinjil

webapp/templates/jury/partials/submission_diff.html.twig

@@ -10,7 +10,7 @@
         {% set extra_css_classes = "" %}
     {%- endfor %}
 
-            <div class="nav-item flex-grow-1 text-end mb-1">
+            <li class="nav-item flex-grow-1 text-end mb-1">
                 <a class="download btn btn-secondary btn-sm"
                    href="{{ path('jury_submission_source', {submission: submission.submitid, fetch: 0}) }}">
                     <i class="fas fa-download"></i> Download
@@ -45,7 +45,7 @@
                     <label class="btn btn-outline-secondary btn-sm" for="{{ editor_id }}-{{ mode_id }}">{{ mode.name }}</label>
                     {%- endfor %}
                 </div>
-            </div>
+            </li>
 </ul>
 <script>
 $(() => {