fix typo in account reports

Change-Id: Ice80bbb6a4cd4ad5ee2390414b106670ee6ce416
Reviewed-on: https://gerrit.instructure.com/35776
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>