fix: (backport) broken Course Overview editor on Schedule & Details page (#2599)

[Kelketek]

Description

This merge request backports a fix for a bug that causes the description editor on the course details page to constantly shove the cursor to the beginning of the field.

Supporting information

openedx#2599

Testing instructions

1. Using tutor 20.x, set up a local installation.
2. Clone this repository and check out the opencraft-release/teak branch to get the broken version
3. Mount using tutor mounts add /path/to/frontend-app-authoring
4. tutor dev launch
5. Check the Scheduling and Details page. Edit using the WYSIWYG editor and notice that the cursor jumps to the beginning each keystroke.
6. In the repository, check out this branch. Refresh the Scheduling and Details page.
7. Observe the cursor behaving correctly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (opencraft-release/teak@f459f53). Learn more about missing BASE report.

Additional details and impacted files

@@                    Coverage Diff                    @@
##             opencraft-release/teak      #96   +/-   ##
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  Coverage                          ?   93.90%           
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  Files                             ?     1149           
  Lines                             ?    24081           
  Branches                          ?     5099           
=========================================================
  Hits                              ?    22613           
  Misses                            ?     1400           
  Partials                          ?       68           

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[tecoholic]

@Kelketek 👍

• I tested this: verified that the issue is fixed in the course overview editor as expected
• I read through the code
• I checked for accessibility issues
• Includes documentation