spec: fix excuse assignment spec fragility
spec: fix excuse assignment spec fragility

closes #CNVS-23366

Change-Id: Idd468bdd1a54831c7f27cac8dfbc4152305693ca
Reviewed-on: https://gerrit.instructure.com/65647
Tested-by: Jenkins
Reviewed-by: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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