fix(comp:modal): the default header size should be 'md'

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

header 使用对象的方式去配置时尺寸大小变成 sm

What is the new behavior?

默认的 header 的 size 为 md

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #969 (d1764b1) into main (4bda54b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #969   +/-   ##
=======================================
  Coverage   92.88%   92.89%           
=======================================
  Files         700      700           
  Lines       68559    68541   -18     
  Branches     8031     8025    -6     
=======================================
- Hits        63684    63668   -16     
+ Misses       4875     4873    -2     

Impacted Files	Coverage Δ
packages/components/_private/footer/index.ts	100.00% <ø> (ø)
packages/components/_private/footer/src/types.ts	100.00% <100.00%> (ø)
packages/components/_private/header/src/Header.tsx	100.00% <100.00%> (ø)
packages/components/card/src/Card.tsx	99.24% <100.00%> (ø)
packages/components/date-picker/src/types.ts	100.00% <100.00%> (ø)
packages/components/drawer/src/DrawerWrapper.tsx	83.38% <100.00%> (-0.11%)	⬇️
packages/components/header/src/types.ts	100.00% <100.00%> (ø)
packages/components/modal/src/ModalWrapper.tsx	81.08% <100.00%> (+0.03%)	⬆️
packages/components/popover/src/Popover.tsx	100.00% <100.00%> (ø)
packages/components/table/__tests__/table.spec.ts	99.41% <100.00%> (ø)
... and 1 more

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