chore: accept should skip when select files rather than dir

[kerm1it]

fix ant-design/ant-design#30403

改动点:

触发 onChange 的时候，只有选择目录的时候，使用 accept 过滤文件，否则直接放行。

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[codecov]

Codecov Report

Merging #329 (a52dc62) into master (00abfee) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
+ Coverage   84.80%   84.92%   +0.12%     
==========================================
  Files           6        6              
  Lines         250      252       +2     
  Branches       60       61       +1     
==========================================
+ Hits          212      214       +2     
  Misses         38       38              

Impacted Files	Coverage Δ
src/AjaxUploader.tsx	82.44% <100.00%> (+0.27%)	⬆️

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[zombieJ]

+ rc-upload@4.3.1

[afc163]

ant-design/ant-design#36318 也需要改一下。