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

src/applications/differential/storage/DifferentialTransaction.php

@@ -100,6 +100,13 @@ final class DifferentialTransaction
           return true;
         }
         break;
+      case DifferentialRevisionRequestReviewTransaction::TRANSACTIONTYPE:
+        // Don't hide the initial "X requested review: ..." transaction from
+        // mail or feed even when it occurs during creation. We need this
+        // transaction to survive so we'll generate mail and feed stories when
+        // revisions immediately leave the draft state. See T13035 for
+        // discussion.
+        return false;
     }
 
     return parent::shouldHide();
@@ -111,12 +118,6 @@ final class DifferentialTransaction
         // Don't hide the initial "X added reviewers: ..." transaction during
         // object creation from mail. See T12118 and PHI54.
         return false;
-      case DifferentialRevisionRequestReviewTransaction::TRANSACTIONTYPE:
-        // Don't hide the initial "X requested review: ..." transaction from
-        // mail even when it occurs during creation. We need this transaction
-        // to survive so we'll generate mail when revisions immediately leave
-        // the draft state. See T13035 for discussion.
-        return false;
     }
 
     return parent::shouldHideForMail($xactions);