R1:6ecdadb76a95

After "Request Review", move revisions with voided "Accepts" into "Ready to Review", not "Waiting on Other Reviewers"

Summary:
Depends on D18756. Fixes T12539. See PHI190. Currently, when this occurs:

- Alice accepts.
- Bailey requests review.
- Alice views her dashboard.

...the revision appears in "Waiting on Other Reviewers" (regardless of whether other reviewers actually exist or not).

Instead, ignore these voided/non-current accepts and let the revisions appear in "Ready to Review", which is…