spec: fix participating_user_id sort in conversations_api_spec
spec: fix participating_user_id sort in conversations_api_spec

Change-Id: I3ab1e733b75bd5055dd7d0914a0e7f967a4fecda
Reviewed-on: https://gerrit.instructure.com/22870
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jon Willesen <eb5ce5e6a76c243326fecfa94534101600f87bd9@instructure.com>
Product-Review: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>
QA-Review: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>

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