Remove link from image file field - link was broken, but we don't want to give original_images public URLs anyhow (ref #87)

wagtail/wagtailimages/templates/wagtailimages/images/_file_field.html

@@ -1,7 +1,7 @@
 {% extends "wagtailadmin/shared/field_as_li.html" %}
 {% load i18n %}
 {% block form_field %}
-    <a href="{{MEDIA_URL}}images/{{ image.file }}" class="icon icon-image">{{ image.filename }}</a><br /><br />
+    <span class="icon icon-image">{{ image.filename }}</span><br /><br />
 
     {% trans "Change image:" %}
     {{ field }}