fix: hide placehoder if showSearch and closed

[MadCcc]

close https://github.com/ant-design/ant-design/issues/33599

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[codecov]

Codecov Report

Merging #706 (9c532a1) into master (b3e80f5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #706   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          25       25           
  Lines        1012     1012           
  Branches      321      321           
=======================================
  Hits         1007     1007           
  Misses          4        4           
  Partials        1        1           

Impacted Files	Coverage Δ
src/Selector/SingleSelector.tsx	100.00% <100.00%> (ø)

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