make grading standards selenium test more robust
make grading standards selenium test more robust

It looks like the fast clicking is not always reliable, so now we wait for the
elements to disappear.

Change-Id: I3a6e2bd24df28d6a70943a8d896a149c58850b75
Reviewed-on: https://gerrit.instructure.com/3841
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Tested-by: Selenium <781b4ea1d853666949b562451f4649afae1f85d5@instructure.com>

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