maps: switch layer list markup to <ul> (#25924)

combo/apps/maps/templates/maps/manager_home.html

@@ -10,13 +10,13 @@
 
 {% block content %}
 {% if object_list %}
-<div class="objects-list layers">
+<ul class="objects-list single-links layers">
  {% for layer in object_list %}
- <div>
+ <li>
   <a class="layer-icon-{{ layer.icon }}" href="{% url 'maps-manager-layer-edit' slug=layer.slug %}">{{ layer.label }}</a>
- </div>
+ </li>
  {% endfor %}
-</div>
+</ul>
 {% else %}
 <div class="big-msg-info">
   {% blocktrans %}