fix: make it work in library v2

[DanielVZ96]

TL;DR - [ A short summary of what this PR does and why ]

JIRA: JIRA-XXXX

What changed?

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Developer Checklist

• Reviewed the release process
• Translations and JS/SASS compiled
• Bumped version number in openassessment/__init__.py and package.json

Testing Instructions

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Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• I've done a visual code review
• I've tested the new functionality

FYI: @openedx/content-aurora

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[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.27%. Comparing base (9671892) to head (bce1829).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
openassessment/xblock/openassessmentblock.py	33.33%	1 Missing and 1 partial ⚠️
openassessment/xblock/studio_mixin.py	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
- Coverage   95.29%   95.27%   -0.02%     
==========================================
  Files         195      195              
  Lines       21624    21629       +5     
  Branches     1502     1504       +2     
==========================================
+ Hits        20606    20607       +1     
- Misses        771      773       +2     
- Partials      247      249       +2     

Flag	Coverage Δ
unittests	95.27% <42.85%> (-0.02%)	⬇️

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