Fixed the "Allow LaTeX Responses" setting

[bdero]

Development for openfun: This is a small fix to make the LaTeX response setting work.

Testing instructions:

1. Go to the Advanced Settings of a course in Studio and add "ora2" to the Advanced Module List
2. Add an Open Response Assessment problem to a new Unit
3. Select "Edit" on the new ORA problem to open the settings modal
4. Change "Allow LaTeX Responses" to True, and click Save to close the settings dialog
5. Select "Edit" again and observe that the "Allow LaTeX Responses" setting is incorrectly set back to False
6. Clone this repository into the /edx/app/src directory, checkout the branch for this PR, and install the xblock like so:

   pip install -e file:///edx/src/edx-ora2/#egg=ora2==localdev
   

7. Restart Studio and perform steps 3 and 4 again
8. Select "Edit" to open the settings dialog again and observe that the value of "Allow LaTeX Responses" was correctly perserved as True

[openedx-webhooks]

Thanks for the pull request, @bdero! It looks like you're a member of a company that does contract work for edX. If you're doing this work as part of a paid contract with edX, you should talk to edX about who will review this pull request. If this work is not part of a paid contract with edX, then you should ensure that there is an OSPR issue to track this work in JIRA, so that we don't lose track of your pull request.

Create an OSPR issue for this pull request.

[openedx-webhooks]

Thanks for the pull request, @bdero! I've created OSPR-1800 to keep track of it in JIRA. JIRA is a place for product owners to prioritize feature reviews by the engineering development teams.

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[bradenmacdonald]

That was fast - thanks @gsong !

[jul]

You are fast!
Looking this on monday.
Promise I will give an answer!