Paused subscriptions should still have access until paid subscription period ends

[joemasilotti]

Fixes an issue where pausing a subscription would remove access immediately, even if the paid subscription hadn't yet expired.

Edit: Unfortunately this enabled anyone with a paused subscription to have access, indefinitely. I opened Pay #660 to ask for some help.

Pull request checklist

• [x] My code contains tests covering the code I modified
• [ ] I linted and tested the project with bin/check
• [x] I added significant changes and product updates to the changelog

[joemasilotti]

Depends on Pay #687.

[joemasilotti]

Closed via #726.