Fixed duplicate content_url tag introduced in r13806 (#18707).

git-svn-id: http://svn.redmine.org/redmine/trunk@13813 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/attachments_helper.rb

@@ -57,7 +57,6 @@ module AttachmentsHelper
       if attachment.thumbnailable?
         api.thumbnail_url thumbnail_url(attachment)
       end
-      api.content_url download_named_attachment_url(attachment, attachment.filename)
       api.author(:id => attachment.author.id, :name => attachment.author.name) if attachment.author
       api.created_on attachment.created_on
     end