Add super to extra for correct overriding

jet/templates/admin/app_index.html

@@ -7,6 +7,7 @@
 {% endblock %}
 
 {% block extrastyle %}
+    {{ block.super }}
     <link rel="stylesheet" type="text/css" href="{% static "admin/css/dashboard.css" %}" />
 
     {% for css in dashboard.media.css %}
@@ -15,6 +16,7 @@
 {% endblock %}
 
 {% block extrahead %}
+    {{ block.super }}
     {% for js in dashboard.media.js %}
         <script src="{% static js %}"></script>
     {% endfor %}

jet/templates/admin/index.html

@@ -7,6 +7,7 @@
 {% endblock %}
 
 {% block extrastyle %}
+    {{ block.super }}
     <link rel="stylesheet" type="text/css" href="{% static "admin/css/dashboard.css" %}" />
 
     {% for css in dashboard.media.css %}
@@ -15,6 +16,7 @@
 {% endblock %}
 
 {% block extrahead %}
+    {{ block.super }}
     {% for js in dashboard.media.js %}
         <script src="{% static js %}"></script>
     {% endfor %}

jet/templates/jet/dashboard/update_module.html

@@ -2,6 +2,7 @@
 {% load i18n jet_tags static %}
 
 {% block extrahead %}
+    {{ block.super }}
     <script type="text/javascript" src="{% static "admin/js/jquery.js" %}"></script>
     <script type="text/javascript" src="{% static "admin/js/jquery.init.js" %}"></script>
     <script type="text/javascript" src="{% static "admin/js/inlines.js" %}"></script>