chore: Adjust functional test params

[pan-kot]

Description

A recently added test (#367) simulates moving cursor close to the screen edge. It passes locally and in PR run, but unfortunately it caused failures in dry-runs: https://github.com/cloudscape-design/components/actions/runs/17243081277

I adjusted the params so that it moves cursor a bit further from the screen edge, which should hopefully be enough. I validated that the test still fails if reverting the auto-scroll changes it was designed to cover.

How has this been tested?

Review checklist

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

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.39%. Comparing base (95e6e11) to head (de707e5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   95.00%   95.39%   +0.39%     
==========================================
  Files          67       67              
  Lines        3282     3282              
  Branches      703      707       +4     
==========================================
+ Hits         3118     3131      +13     
+ Misses        164      151      -13     

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