another datafixup before adding FK

Change-Id: I3a1252f03f7c659379fb929e826edc64937f022e
Reviewed-on: https://gerrit.instructure.com/30217
Reviewed-by: Simon Williams <simon@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>