fix destroyFns not reduce when instance.destroy()

[xu-snow]

This is a ...

• Bug fix

What's the background?

1. in confirm.destroy(), destroyFns will never contain destroy , it is simple code problem, destroyFns contain close instead
2. it will make the destroyFns not change when user manually close confirm dialog

Changelog description (Optional if not new feature)

1. fixbug,confirm destroy() has unreachable code
2. fixbug, 销毁对话框函数 destroy() 有永远不会执行到的代码块

Self Check before Merge

• Doc is or not needed
• Demo not needed
• TypeScript not needed
• Changelog not needed

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[codecov]

Codecov Report

Merging #14600 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #14600   +/-   ##
=======================================
  Coverage   94.43%   94.43%           
=======================================
  Files         333      333           
  Lines        7264     7264           
  Branches     1788     1821   +33     
=======================================
  Hits         6860     6860           
  Misses        389      389           
  Partials       15       15

Impacted Files	Coverage Δ
components/modal/confirm.tsx	96.77% <100%> (+3.22%)	⬆️
components/upload/UploadList.tsx	88.03% <0%> (-1.71%)	⬇️

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[ycjcl868]

close is right.