please hide reply to now-hidden automated social network invite

https://bugs.launchpad.net/aptdaemon/+bug/659438/comments/138 is a reply to an automated invite in bug 659438 that itself appears to have been hidden. This reply should probably also be hidden, especially since it quotes the original message in full. Since this is not technically spam and almost certainly did not involve malicious intent on the part of any person, however, I don't think anyone's account should be suspended (even temporarily).