R1:de6c68b91e57

Always show "X requested review" in mail to stop some undraft mail from being dropped

Summary: Ref T13035. See that task for a description of the issue.

Test Plan:
- Enabled prototypes.
- Disabled all Herald rules that trigger Harbormaster builds.
- Created a new revision.
- Before patch: initial review request email was dropped.
- After patch: initial review request email is sent.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13035

Differential Revision: https://secure.