trombi: add safeguard on user deletion

Signed-off-by: Skia <skia@libskia.so>

trombi/templates/trombi/detail.jinja

@@ -25,7 +25,7 @@
                 <img src="{{ file }}" alt="" style="max-width: 100px">
             </div>
             <div>{{ u.user.get_display_name() }}</div>
-            <div><a href="{{ url('trombi:delete_user', trombi_id=object.id, user_id=u.id) }}">{% trans %}Delete{% endtrans %}</a></div>
+            <div><a href="{{ url('trombi:delete_user', user_id=u.id) }}">{% trans %}Delete{% endtrans %}</a></div>
         </div>
     {% endfor %}
     </div>