Remove the feature link from the trash and spam pages

Applies to https://github.com/GigaOM/gigaom/issues/5248

Using the global set in `bSocial_Comments_Feedback_Table` to filter for the trash and spam pages and bail before outputting the feature link.
see:
https://core.trac.wordpress.org/browser/tags/4.0/src/wp-includes/comment.php#L1466

and:
https://core.trac.wordpress.org/browser/tags/4.0/src/wp-includes/comment.php#L1507

Lots of different possible values for approved/unapproved and not immediately clear which are acceptable in all situations.