tuning: Fix user groups UI

tuning/static/majak/css/tuning.css

+/* fix UI on users's groups config */
+#id_groups label {
+    width: 100%;
+}

tuning/templates/wagtailadmin/admin_base.html

 {% extends "wagtailadmin/admin_base.html" %}
 {% load static %}
 
+{% block css %}
+  {{ block.super }}
+  <link rel="stylesheet" href="{% static "majak/css/tuning.css" %}" type="text/css" />
+{% endblock %}
+
 {% block branding_title %}Maják{% endblock %}
 
 {% block branding_favicon %}