fix(challenge): DiffPresenter should be deferred

It takes some time to generate the diff.

Author: pan93412

templates/components/Challenge/Tabs.html.twig

@@ -18,7 +18,7 @@
         {% elseif currentTab == 'events' %}
             <twig:Challenge:Tabs:Events :question="question" :user="user" />
         {% elseif currentTab == 'diff' %}
-            <twig:Challenge:Tabs:DiffPresenter :question="question" :user="user" />
+            <twig:Challenge:Tabs:DiffPresenter :question="question" :user="user" loading="defer" />
         {% else %}
             <twig:Challenge:Tabs:UserQueryResult :question="question" :user="user" loading="defer" />
         {% endif %}