Blogs: when un-spamming a user, restore blog records.

When marking a user as a spammer, all BuddyPress data is deleted including the user's recorded blog(s). When you ham the user, their profile won't show their blog(s) anymore. This change adds a function to the ham action to re-calculate the user's blogs.

Fixes #5857, props imath, DJPaul.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9280 cdf35c40-ae34-48e0-9cc9-0c9da1808c22