fix(Sidenav): remove underline from focused sidenav item

[SevenOutman]

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[codecov]

Codecov Report

Merging #2387 (9d1a5f1) into main (3d3bcca) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2387   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         274      274           
  Lines        8647     8647           
  Branches     2428     2428           
=======================================
  Hits         7399     7399           
  Misses        659      659           
  Partials      589      589           

Flag	Coverage Δ
ChromeCi	85.54% <ø> (ø)
Firefox	85.54% <ø> (ø)

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