fix gradebook history for quiz regrades

fixes CNVS-16182

Change-Id: I1ceadbd241d593d966640f21b77528daab7ed11e
Reviewed-on: https://gerrit.instructure.com/42687
Reviewed-by: Ryan Taylor <rtaylor@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
QA-Review: Amber Taniuchi <amber@instructure.com>
Product-Review: Cameron Matheson <cameron@instructure.com>