Fix an issue where certain configurations could fail to publish revision feed stories

Summary: See PHI292. This is just a generalization of D18851: feed stories have the same issue as mail. Don't hide "requested a review" in either mail or feed.

Test Plan:

• Enable prototypes.
• No harbormaster builds.
• Create a revision.
  • Pre-patch: no feed story.
  • Post-patch: feed story.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D18886