Replace make_spam_user hooks after processing in bp_core_process_spammer_status()

We initially unhook them to avoid unwanted looping within the function, and we
must replace them so that bulk spamming and hamming work as expected.

Fixes #5229

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7514 cdf35c40-ae34-48e0-9cc9-0c9da1808c22