Fix repository file tree browser top overlap (old UI)

Jacques Erasmusrequested to merge
581015-fix-ftb-overlap into master

What does this MR do and why?

Adds 1px to the top calc in the old UI to account for the border

Screenshots or screen recordings

Before After
Screenshot_2025-11-25_at_10.38.20 Screenshot_2025-11-25_at_10.38.31
Screenshot_2025-11-25_at_10.39.05 Screenshot_2025-11-25_at_10.39.14

How to set up and validate locally

  1. Open the repository file tree browser in the old (non-paneled) UI.
  2. Check that the top does not overlap the header border.

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Related to #581015 (closed)

Edited by Jacques Erasmus

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