Update logged_out.html

Repair click button cannot be closed

xadmin/templates/xadmin/views/logged_out.html

@@ -16,7 +16,7 @@
       <h2 class="text-success">{% trans "Logout Success" %}</h2>
       <p>{% trans "Thanks for spending some quality time with the Web site today." %}</p>
       <p class="btn-group">
-        <a href="#" onclick="javascript:window.opener=null;window.open('','_self');window.close();" class="btn btn-primary">{% trans 'Close Window' %}</a>
+        <a href="#" onclick="javascript:window.location.href='about:blank';window.close();" class="btn btn-primary">{% trans 'Close Window' %}</a>
         <a href="{% url 'xadmin:index' %}" class="btn btn-default">{% trans 'Log in again' %}</a>
       </p>
     </div>