fix(date-picker): add props(mode) value -- decade

[Hyphon]

First of all, thank you for your contribution! 😄

New feature please send pull request to feature branch, and rest to master branch. Pull request will be merged after one of collaborators approve. Please makes sure that these form are filled before submitting your pull request, thank you!

[中文版模板 / Chinese template]

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

1. bug fix
2. prop type check failed problem
3. date-picker mode接口设置decade报warning #3463

API Realization (Optional if not new feature)

none

What's the effect? (Optional if not new feature)

none

Changelog description (Optional if not new feature)

1. fix date-picker'props mode value: decade
2. 修复 date-picker 属性 mode 的值：decade

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

Additional Plan? (Optional if not new feature)

none

[tangjinzhou]

you alse can pr it to master branch for v1.x.
thanks!

[github-actions]

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