fix: incorrect message for locking

[DmytroAlipov]

Description:

Reproduction steps:

1. Two Staff go to Instructors tab
2. Open responses and choose ORA
3. By each staff choose user answer
4. By first staff click on "Start grading" button
5. By second staff click on "Start grading" button

Then for the second Staff it will be displayed:

The message selection process was incorrect because a 409 was received from the server (as intended).

Now this message is displayed:

[openedx-webhooks]

Thanks for the pull request, @DmytroAlipov!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f433d33) to head (b3879cb).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #326   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          111       111           
  Lines         1082      1082           
  Branches       159       159           
=========================================
  Hits          1082      1082           

☔ View full report in Codecov by Sentry.
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[DmytroAlipov]

@mphilbrick211 @arbrandes hi 😉 just a friendly ping

[arbrandes]

Apologies it took a while, but I have no objections. Approved!

[arbrandes]

I set this to auto-merge once the branch is rebased.

[DmytroAlipov]

Hi @arbrandes
I rebased, but the auto-merge didn't happen.

[mphilbrick211]

Hi @arbrandes I rebased, but the auto-merge didn't happen.

@arbrandes flagging this for you!