Move placeholder to blog_ungleich

This was the cause why the structure/content switch was not available on the blog page

ungleich/templates/cms/ungleichch/base_ungleich.html

@@ -55,7 +55,6 @@
       <div class="row">
 	<div class="col-lg-8 col-lg-offset-2 col-md-10 col-md-offset-1">
 	  {% block base_content %}
-	  {% placeholder "default" %}
 	  {% endblock %}
 	</div>
       </div>

ungleich/templates/cms/ungleichch/blog_ungleich.html

@@ -1,5 +1,5 @@
 {% extends "base_ungleich.html" %}
+{% load cms_tags %}
 {% block base_content %}
-{% block content %}
-{% endblock %}
+{% placeholder "default" %}
 {% endblock %}