fix: updating the keys for the ui config in custom_prompt

[felipemontoya]

The keys for the config where incorrectly refactored as "provider"

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[felipemontoya]

@Henrrypg this was an error in an earlier refactor done by us

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.74%. Comparing base (e6caf77) to head (cfc81fd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   90.74%   90.74%           
=======================================
  Files          48       48           
  Lines        4389     4389           
  Branches      271      271           
=======================================
  Hits         3983     3983           
  Misses        317      317           
  Partials       89       89           

Flag	Coverage Δ
unittests	90.74% <ø> (ø)

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