fix(code-editor): Allow for correct border radius theming

[fralongo]

Description

Allows to set a custom value for code editor border radius. The fix is needed before making the border radius themeable (#221)

How has this been tested?

[How did you test to verify your changes?] Locally

[Check for unexpected visual regressions, see CONTRIBUTING.md for details.]

Documentation changes

[Do the changes include any API documentation changes?]

• Yes, this change contains documentation changes.
• No.

Related Links

#221

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md. max CSS function is supported in all browsers that Cloudscape supports: https://developer.mozilla.org/en-US/docs/Web/CSS/max
• [N/A] Changes were manually tested for accessibility, see accessibility guidelines.

Security

• [N/A] If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

Covered by internal visual regression tests

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #242 (cad3ca1) into main (d4e70a6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files         555      555           
  Lines       15708    15708           
  Branches     4295     4295           
=======================================
  Hits        14560    14560           
  Misses       1067     1067           
  Partials       81       81           

Impacted Files	Coverage Δ
src/code-editor/index.tsx	87.40% <ø> (ø)

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