make discussion scope id unambiguous
make discussion scope id unambiguous

fixes CNVS-21236

test plan:
  - in a course with DA on
  - make a few active course discussions
    - publish them and assign them to everybody
  - make a few group level discussions
    - go to a group discussion index
      - as a teacher it loads
      - as a student it loads

Change-Id: I196cbb4402d3d08dff8bd766443ad5bc7f610aed
Reviewed-on: https://gerrit.instructure.com/58863
Reviewed-by: John Corrigan <3d73713d0cc718326e4fd7c06c64e067ad6e2270@instructure.com>
Tested-by: Jenkins
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
Product-Review: Matt Berns <e53c8988cd428dde240324ce2797c8eb7073560f@instructure.com>

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