Fixed order syntax for Rails 3 (#18667).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13810 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/integration/attachments_test.rb

@@ -29,7 +29,7 @@ class AttachmentsTest < ActionController::IntegrationTest
       post "/uploads.js?attachment_id=1&filename=foo.txt", "File content", {"CONTENT_TYPE" => 'application/octet-stream'}
       assert_response :success
     end
-    attachment = Attachment.order(:id => :desc).first
+    attachment = Attachment.order('id DESC').first
     assert_equal 'text/plain', attachment.content_type
   end