subreddit images: Remove some cruft left over from the old system.

All images in the new system are guaranteed to be proper URLs by the
migration and way the new system works.

r2/r2/templates/subredditstylesheet.html

@@ -257,19 +257,6 @@
     <ul id="image-preview-list" class="image-list">
       <%def name="make_li(name='', img=None, prototype=False)">
         <li ${"style='display:none'" if img is None else ""}>
-          <% 
-             if img is not None:
-                 if isinstance(img, int):
-                    bucket = g.s3_old_thumb_bucket
-                    baseurl = "http://%s" % (bucket)
-                    if g.s3_media_direct:
-                        baseurl = "http://%s/%s" % (s3_direct_url, bucket)
-                        
-                    img = "%s/%s_%d.png" % \
-                    (baseurl, c.site._fullname, img)
-             else:
-                 img = static('kill.png')
-             %>
           <a href="${img}" class="preview">
             <img id="img-preview-${name}" src="${img}" 
                  alt="Image ${name}" title="click to preview"/>