Fix closable Drawer hiding without transition

[afc163]

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?

Closable Drawer hiding without transition.

When close Drawer in https://codesandbox.io/s/4r5y562pmx, the box-shadow in drawer will disappear immediately. We should add transtion on it.

API Realization (Optional if not new feature)

Look the code diff.

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

1. Does this PR affect user? Which part will be affected?
2. What will say in changelog?
3. Does this PR contains potential break change or other risk?

Changelog description (Optional if not new feature)

1. English description

• Fix closable Drawer hiding without transition.

2. Chinese description (optional)

• 修复关闭抽屉时浮层阴影没有缓动消失的细节。

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

[codecov]

Codecov Report

Merging #15147 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15147      +/-   ##
==========================================
+ Coverage   93.11%   93.16%   +0.04%     
==========================================
  Files         237      237              
  Lines        6261     6261              
  Branches     1870     1838      -32     
==========================================
+ Hits         5830     5833       +3     
+ Misses        430      427       -3     
  Partials        1        1

Impacted Files	Coverage Δ
components/_util/wave.tsx	87.5% <0%> (+2.88%)	⬆️

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