fix(form): 删除form在0.x下导致千牛端报错的无用代码

[Alpsli]

• 删除form在0.x下导致千牛端报错的无用代码

[github-actions]

🎊 PR Preview c6833f7 has been successfully built and deployed to https://ant-design-ant-design-mini-preview-pr-555.surge.sh

🕐 Build time: 314.774s

_{🤖 By surge-preview}

[codecov-commenter]

Codecov Report

Base: 4.90% // Head: 4.93% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (c6833f7) compared to base (596afee).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #555      +/-   ##
=========================================
+ Coverage    4.90%   4.93%   +0.03%     
=========================================
  Files         155     153       -2     
  Lines        3158    3138      -20     
  Branches      802     801       -1     
=========================================
  Hits          155     155              
+ Misses       2619    2600      -19     
+ Partials      384     383       -1     

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