ui: remove outdated csrfToken field

packages/ui-default/templates/discussion_create.html

@@ -10,7 +10,6 @@
         <form method="post">
           {% include "partials/discussion_edit_form.html" %}
           <div class="row"><div class="columns">
-            <input type="hidden" name="csrfToken" value="{{ handler.csrfToken }}">
             <button type="submit" class="rounded primary button">
               {{ _('Create') }} (Ctrl+Enter)
             </button>