Added scheduler selenium spec to cover a regression test case
Added scheduler selenium spec to cover a regression test case

Fixes CNVS-17529

Test Plan:
* Run /spec/selenium/teacher_schedule_spec.rb and make sure everything passes

Test case: https://canvas.testrail.com/index.php?/cases/view/85934&group_by=cases:section_id&group_order=asc&group_id=4118

Change-Id: I9a6087a1326bffa23ee7ae886371448d58f89469
Reviewed-on: https://gerrit.instructure.com/45934
Reviewed-by: Sean Lewis <e0580b9aacf857d9a3792f1965500f217c0fc9c9@instructure.com>
Product-Review: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>
QA-Review: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>
Product-Review: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>
QA-Review: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

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