chore: Re-add margin for VR sticky-scrollbar when offset

[rubencarvalho]

Description

Re-added the margin that was necessary for avoiding sticky scrollbar overlap with interactive elements on a VR compact mode table.
This regression was introduced here: https://github.com/cloudscape-design/components/pull/1554/files#diff-b75a1d7e7c07f45b0c5b02301c632dc0cd30bc15c824eb2d951d1f697cd22803L41-L43 and caught on visual regression tests.

How has this been tested?

dev-v3-rucarva pipeline screenshot tests

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 lines are covered by tests ✅

Comparison is base (6544a4d) 94.01% compared to head (a6ff934) 94.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1582   +/-   ##
=======================================
  Coverage   94.01%   94.01%           
=======================================
  Files         649      649           
  Lines       17533    17533           
  Branches     5760     5760           
=======================================
  Hits        16484    16484           
  Misses        980      980           
  Partials       69       69           

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