fix(MultiCascader): fix not rendering the count of selected values

[simonguo]

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[codecov]

Codecov Report

Merging #2289 (a9a6621) into main (be9c756) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2289   +/-   ##
=======================================
  Coverage   85.69%   85.69%           
=======================================
  Files         274      274           
  Lines        8576     8576           
  Branches     2379     2379           
=======================================
  Hits         7349     7349           
  Misses        666      666           
  Partials      561      561           

Flag	Coverage Δ
ChromeCi	85.66% <ø> (ø)
Firefox	85.66% <ø> (ø)

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Impacted Files	Coverage Δ
src/MultiCascader/MultiCascader.tsx	77.24% <ø> (ø)

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