fix(templates): remove stray closing divs on import/export and list pages

Extra or unmatched </div> tags inside {% block content %} closed layout
ancestors early, which broke the centered main column and stacked modals
and scripts incorrectly.

- import_export/index.html: drop duplicate grid closer
- saved_filters/list.html: remove orphan closer after page body
- time_entry_templates/list.html: same orphan pattern as saved filters

app/templates/import_export/index.html

@@ -204,7 +204,6 @@
             </div>
         </div>
     </div>
-</div>
 
 <!-- Toggl Import Modal -->
 <div id="toggl-modal" class="hidden fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">

app/templates/saved_filters/list.html

@@ -99,7 +99,6 @@
         type='no-data'
     ) }}
     {% endif %}
-</div>
 
 <script>
 function applyFilter(filterId, scope) {

app/templates/time_entry_templates/list.html

@@ -117,7 +117,6 @@
         type='no-data'
     ) }}
     {% endif %}
-</div>
 
 <script>
 function useTemplate(templateId) {