Fix irreversible RunPython operation in 0020 migration

[cliffordgama]

Fixes #474

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.78%. Comparing base (6edef72) to head (50c0457).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...nterface/migrations/0020_module_selected_colors.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #475      +/-   ##
==========================================
- Coverage   97.44%   96.78%   -0.67%     
==========================================
  Files          40       40              
  Lines         431      435       +4     
==========================================
+ Hits          420      421       +1     
- Misses         11       14       +3     

Flag	Coverage Δ
unittests	96.78% <25.00%> (-0.67%)	⬇️

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[fabiocaccamo]

@cliffordgama thank you very much for this PR.