fix: 400 error editing comment

[DmytroAlipov]

This is a backport from the master and and this PR

Description

When trying to edit a comment, an error 400 occurred. Provided that the user is a course instructor or staff, and simultaneously the author of the comment.

The issue is the presence of the editReasonCode parameter in the request.

This parameter is expected only if the editor is not the author of the comment, and is a staff or instructor.

After the fixes, everything works correctly.

Merge Checklist

• [ ] If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• [ ] Is there adequate test coverage for your changes?

Post-merge Checklist

• [ ] Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• [ ] 🎉 🙌 Celebrate! Thanks for your contribution.

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (open-release/palm.master@5c6e40b). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## open-release/palm.master #535 +/- ## =========================================================== Coverage ? 92.38% =========================================================== Files ? 163 Lines ? 3294 Branches ? 890 =========================================================== Hits ? 3043 Misses ? 232 Partials ? 19 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[awais-ansari]

@DmytroAlipov Thanks for your contribution. Please resolve the conflict. The Team will review your PR very soon and let you know about it.

[DmytroAlipov]

@awais-ansari done ;)

[openedx-webhooks]

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