[Content curation working group] Opening immediately deactivated when entering review period

Note: this was replicated using PR #103, which may be outdated. All calls are assumed to be via polkadot.js via Pioneer

Problem

When I begin the applicant review for an opening, the opening is immediately deactivated.

Steps to reproduce

1. Create a new curator opening. I'm setting it active at the current block, with a max review length of 99999, rationing policy of max_active_applicants: 10. There are no required stakes. This extrnsic is resolved successfully.
2. (optional) Make a curator application. The application is stored properly, and recorded against both the Opening and the CuratorOpening.
3. Call begin_curation_applicant_review, passing the ID of the opening created in step 1. This extrnsic is resolved successfully.
4. Check the status of the opening; it is deactivated. Example status dump from polkadot:

What I should see

The opening should be in a review state, not a deactivated state.

Analysis

Deactivation cause 3 seems to be review period expired... but as far as I can tell, the review period has not expired.

┆Issue is synchronized with this Asana task by Unito

Start in substrate-hiring-module/src/hiring/opening.rs at the deactivation cause 3 referenced by the issue, then reproduce the flow through begin_curation_applicant_review using polkadot.js via Pioneer. Compare the opening status before and after review begins and confirm that a valid review-period opening remains in review rather than becoming deactivated.