Show discarded review requests in the "All Review Requests" view.
For some reason, we chose to filter public discarded review requests out of the

list view. This made it very hard to find old changes that had been closed out

for some reason (they were only available in the submitter lists). This change

includes them along with "Submitted" review requests, and changes the show/hide

toggle to be "closed" instead of "submitted".

Discarded a review request. Saw that I could see it in the "All Review

Requests" view. Checked that "Hide closed" filtered out both submitted and

discarded review requests.