ui: fix lists not being rendered correctly

passbook/sources/ldap/templates/ldap/property_mapping_form.html

@@ -8,7 +8,7 @@
     <div class="c-form__horizontal-group">
         <p>
             Expression using <a href="https://jinja.palletsprojects.com/en/2.11.x/templates/">Jinja</a>. Following variables are available:
-            <ul>
+            <ul class="pf-c-list">
                 <li><code>ldap</code>: A Dictionary of all values retrieved from LDAP.</li>
             </ul>
         </p>