fix outcomes#show json response in course context, fixes #4430
fix outcomes#show json response in course context, fixes #4430

Change-Id: I58081ebf7958c863f286cf19ccfa0016e0366497
Reviewed-on: https://gerrit.instructure.com/3418
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Brian Whitmer <760e7dab2836853c63805033e514668301fa9c47@instructure.com>

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