Update syntax in DateValidatorSpec
Update syntax in DateValidatorSpec

Change a few things so they conform to the style guide

Refs: SIS-2636

Test Plan: QA will review the functionality in the final commit.

Change-Id: Ib0fd6699188a6dacd3353854ac290c01966c9517
Reviewed-on: https://gerrit.instructure.com/101391
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
Product-Review: Stewie aka Nicholas Stewart <bec99285d8f1953757afca2af84365b0776c1eb4@instructure.com>
QA-Review: Stewie aka Nicholas Stewart <bec99285d8f1953757afca2af84365b0776c1eb4@instructure.com>

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