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.
I've been increasingly using whitelists rather than blacklists. They allow you to assert that you're specifically supporting something. Imagine what happens when a new status is introduced...