Restore normal breadcrumb block in admin/base.html

This was overridden for some reason, causing the 'Home' link to be incorrect
for templates that inherit admin/base.html directly.

admin_tools/theming/templates/admin/base.html

@@ -55,7 +55,12 @@
         {% block nav-global %}{% endblock %}
     </div>
     <!-- END Header -->
-    {% block breadcrumbs %}<div class="breadcrumbs"><a href="/">{% trans 'Home' %}</a>{% if title %} &rsaquo; {{ title }}{% endif %}</div>{% endblock %}
+    {% block breadcrumbs %}
+    <div class="breadcrumbs">
+    <a href="{% url 'admin:index' %}">{% trans 'Home' %}</a>
+    {% if title %} &rsaquo; {{ title }}{% endif %}
+    </div>
+    {% endblock %}
     {% endif %}
 
         {% if messages %}