correct issue with intra_group_peer_review
correct issue with intra_group_peer_review

fixes OUT-507

test plan:
- create an assignment with peer reviews set to automatically assign
- have a student submit to the assignment
- as the teacher pull up the to-do list api
  (api/v1/users/self/todo?as_user_id={#teacher_id})
- the response should have the todo list item and not
  return an error

Change-Id: Ie83e4b13cad29b7ab46e362b0f92d1ac7264e2f3
Reviewed-on: https://gerrit.instructure.com/95595
Tested-by: Jenkins
Reviewed-by: Michael Brewer-Davis <785693f4c81267e5b88c0f98d39b56a39a2b6910@instructure.com>
QA-Review: Alex Ortiz-Rosado <0d962001085a39e5d1cf1e3401131c0acb3ce8a1@instructure.com>
QA-Review: Cemal Aktas <92f142e4a145271fd784e7ddaa1fc1ff0aed3773@instructure.com>
Product-Review: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>

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