Fix up a couple places that used select_related() with incorrect field names.

Review Request #8697 — Created Jan. 31, 2017 and submitted — Latest diff uploaded

Information

Review Board
release-3.0.x
bb27629...

Reviewers

Django 1.8 helpfully throws an error if select_related() is called with a
field name that doesn't exist. There were a couple places that were doing this
(columns in the reviews datagrid on the users page and the e-mail
notifications), and we just didn't notice that they were doing more queries
than expected as a result.

Ran unit tests.