fix: fix form-textarea onFocus not working

[DiamondYuan]

No description provided.

[github-actions]

🎊 PR Preview a80fa22 has been successfully built and deployed to https://ant-design-ant-design-mini-preview-pr-814.surge.sh

🕐 Build time: 255.392s

_{🤖 By surge-preview}

[DiamondYuan]

fix #809

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.44% 🎉

Comparison is base (6a48a49) 26.59% compared to head (a80fa22) 28.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #814      +/-   ##
==========================================
+ Coverage   26.59%   28.04%   +1.44%     
==========================================
  Files         158      158              
  Lines        3316     3316              
  Branches      872      872              
==========================================
+ Hits          882      930      +48     
+ Misses       2121     2074      -47     
+ Partials      313      312       -1     

Files Changed	Coverage Δ
src/Form/FormTextarea/index.ts	26.92% <100.00%> (+26.92%)	⬆️

... and 2 files with indirect coverage changes

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