fix(PanelGroup): missing border for nested panels

[SevenOutman]

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[codecov]

Codecov Report

Merging #2142 (9394d33) into main (57ce5b0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2142   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files         267      267           
  Lines        8401     8401           
  Branches     2286     2286           
=======================================
  Hits         7172     7172           
  Misses        690      690           
  Partials      539      539           

Flag	Coverage Δ
ChromeCi	85.34% <ø> (ø)
Firefox	85.35% <ø> (ø)

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