Fixed #19331 -- Added missing trailing slash in auth admin template

<a href="{% url 'admin:index' %}">{% trans 'Home' %}</a>

&rsaquo; <a href="{% url 'admin:app_list' app_label=opts.app_label %}">{{ opts.app_label|capfirst|escape }}</a>

&rsaquo; <a href="{% url opts|admin_urlname:'changelist' %}">{{ opts.verbose_name_plural|capfirst }}</a>

&rsaquo; <a href="{% url opts|admin_urlname:'changelist' %}{{ original.pk }}">{{ original|truncatewords:"18" }}</a>

&rsaquo; <a href="{% url opts|admin_urlname:'changelist' %}{{ original.pk }}/">{{ original|truncatewords:"18" }}</a>

› {% trans 'Change password' %}

</div>

{% endblock %}