cleaned up DelayedAlertSenderSpec
cleaned up DelayedAlertSenderSpec

fixes: CNVS-12476

test plan:
- no QA needed, spec changes only

Change-Id: Ic7d4340acfcc27c8b24d461856d3eca61c7853d7
Reviewed-on: https://gerrit.instructure.com/33394
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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