fix(Sidenav): remove underline on hovered SidenavItem

[SevenOutman]

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rsuite-v4 – ./docs

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[codecov]

Codecov Report

Merging #2118 (de5366d) into main (64b7d68) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2118   +/-   ##
=======================================
  Coverage   85.27%   85.27%           
=======================================
  Files         266      266           
  Lines        8389     8389           
  Branches     2286     2286           
=======================================
  Hits         7154     7154           
  Misses        693      693           
  Partials      542      542           

Flag	Coverage Δ
ChromeCi	85.17% <ø> (ø)
Firefox	85.26% <ø> (ø)

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