templates: adapt wcs base template to recent changes (#25265)

templates/wcs/base.html

@@ -49,7 +49,9 @@ Compte Citoyen
   {% block content %}
   {% if bigdiv %}<div id="{{bigdiv}}" {% if breadcrumb %}class="has-breadcrumb"{% endif %}>{% endif %}
   {% if title %}<h2>{{title}}</h2>{% endif %}
+  {% block body %}
   {{ body|safe }}
+  {% endblock %}
   {% if bigdiv %}</div>{% endif %}
   {% endblock %}
 {% endblock %}