Spam-checking moderation doesn't make sense

Sending moderation stuff through AbuseFilter makes it slow
because there are filters matching against the post's content.
Said content will have to be run through Parsoid, which will
make it slow.
AFAIK, core moderation stuff doesn't go through AbuseFilter either.

I'd remove this, unless there's a very good reason to keep it.

Change-Id: I167acbb11423004cdeb37a5763d1a0ee6ea2f863
Merge "Spam-checking moderation doesn't make sense"