App stats - unread flag for questions is inaccurate

[jimmymlu]

User: https://hello-admin.appspot.com/account_profile/[email protected]&type=email

If you look at his app stats via /v1/app/stats/unread the flag for unanswered questions is true. However, if you look at questions for today there are none.

note
We will be revisiting how the unread indicator is displayed on the client in our next release, but for now the user cannot clear his indicator for this reason so it might be worth a quick fix if it's easy.

[decarbonization]

changes waiting on testing + deploy