don't show deleted assignment groups in the new graded discussion page
don't show deleted assignment groups in the new graded discussion page

Change-Id: Ifccdd950718ce627a91aa350d74d74282f54c719
fixes: #5345
Reviewed-on: https://gerrit.instructure.com/5169
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>

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