hotfix - fix duplicate rows when filtering on ROB owners #782
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Previously, when filtering a study, if a user conducted both an individual and final review, the row would be shown twice when filtering on a user. Adding distinct fixes. We cannot add the filterset filter directly, since we're overriding the queryset being used.
Fixes duplication here:
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rob/assessment/:id/study-assignments/
rob/assessment/:id/study-assignments/update/