Fix some more unit test failures with closing non-public reviews.
Fix some more unit test failures with closing non-public reviews.

The recent change to disallow closing non-public review requests as "submitted"
needed some unit tests to be updated. The change itself fixed test failures on
release-2.0.x, but the master branch also had a couple tests that needed to be
fixed. This updates those.

Testing done:
Ran unit tests.

Reviewed at https://reviews.reviewboard.org/r/7013/

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