Move labels above the form field in the image format chooser

wagtail/images/templates/wagtailimages/chooser/select_format.html

@@ -12,7 +12,7 @@
             {% csrf_token %}
             <ul class="fields">
                 {% for field in form %}
-                    {% include "wagtailadmin/shared/field_as_li.html" with field=field %}
+                    {% include "wagtailadmin/shared/field_as_li.html" with field=field li_classes="label-above" %}
                 {% endfor %}
                 <li><input type="submit" value="{% trans 'Insert image' %}"  class="button" /></li>
             </ul>