fix bug in adding user notes to teachers

fixes CNVS-13347

Change-Id: I69cb5464f98288f2f28f5bb1664f23292307a4fc
Reviewed-on: https://gerrit.instructure.com/35659
Reviewed-by: Braden Anderson <banderson@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Adam Phillipps <adam@instructure.com>
QA-Review: Adam Phillipps <adam@instructure.com>