fix(Tag): incorrect border color when using plain

[chenjiahan]

#8578

[codecov-commenter]

Codecov Report

Merging #8601 (6f36077) into dev (02d446e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #8601   +/-   ##
=======================================
  Coverage   86.52%   86.52%           
=======================================
  Files         217      217           
  Lines        5424     5424           
  Branches     1340     1340           
=======================================
  Hits         4693     4693           
  Misses        461      461           
  Partials      270      270           

Impacted Files	Coverage Δ
src/tag/Tag.tsx	100.00% <ø> (ø)

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