spec: teacher speed grader intermittent spec fix
spec: teacher speed grader intermittent spec fix

Change-Id: I6f9679bc8e147aa9d361395f9770fb83455880ff
Reviewed-on: https://gerrit.instructure.com/16963
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jake Sorce <c8d99c2f7cd5f432c163abcd422672b9f77550bb@instructure.com>
QA-Review: Jake Sorce <c8d99c2f7cd5f432c163abcd422672b9f77550bb@instructure.com>

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