Always show 'Details' button on shift list items

shiftregister/app/templates/partials/shift_listitem.html

@@ -8,11 +8,10 @@
             <strong>Beginn:</strong> {{ shift.start_at }}<br>
             <strong>Dauer:</strong> {{ shift.duration }}
         </div>
-        <div class="is-flex is-justify-content-end">
-{% if registered %}
+        <div class="buttons is-right">
             <a class="button is-info is-small" href="{% url 'shift' shift.id %}">Details</a>
-{% else %}
-            <a class="button is-primary is-small" href="{% url 'shift' shift.id %}">Mithelfen</a>
+{% if not registered %}
+            <a class="button is-primary is-small ml-3" href="{% url 'shift' shift.id %}">Mithelfen</a>
 {% endif %}
         </div>
     </div>