use .links-list class to notifications-cell list (#43698)

combo/apps/notifications/templates/combo/notificationscell.html

@@ -2,6 +2,7 @@
 {% block cell-content %}
 <h2>{% trans "Notifications" %}</h2>
 {% if notifications %}
+<div class="links-list">
 <ul>
   {% for notification in notifications %}
   <li class="combo-notification {% if notification.acked %}combo-notification-acked{% endif %}"
@@ -15,6 +16,7 @@
   </li>
   {% endfor %}
 </ul>
+</div>
 {% else %}
 <div>
 <p>{% trans 'No notifications.' %}</p>