Fix: some default setting not updating with updated default settings

[DmytroAlipov]

Description

Some default setting ( Show reset option, Show answer, Randomization) not updating with updated default settings.

Testing instructions

1. Check in Studio -> Settings -> Advanced settings values for Show reset button for problems, Show answer and Randomization:
   
2. Add problem -> check values for options - verify that they are the same as in Advanced settings
   
3. For problem change values for same options to some other values (not default), save changes
   
4. Click on Edit for problem and set for options same values as the default ones in Advanced settings (as they were in step 2), save changes
5. Check if new values were set

Actual Result:

Previous values are displayed (from step 3) - not as they were set in step 4

[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 92.22%. Comparing base (6255768) to head (3a8485b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1269   +/-   ##
=======================================
  Coverage   92.22%   92.22%           
=======================================
  Files        1009     1009           
  Lines       18565    18565           
  Branches     3965     3912   -53     
=======================================
  Hits        17122    17122           
- Misses       1374     1376    +2     
+ Partials       69       67    -2     

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

hi @KristinAoki
Please look at this fix, some corrections affect your implementation.