toast传入element报ts错误

[huyaweii]

First of all, thank you for your contribution! :-)

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

• Make sure that you follow antd's code convention.
• Run npm run lint and fix those errors before submitting in order to keep consistent code style.
• Rebase before creating a PR to keep commit history clear.
• Add some descriptions and refer relative issues for you PR.

Extra checklist:

if isBugFix :

• Make sure that you add at least one unit test for the bug which you had fixed.

elif isNewFeature :

• Update API docs for the component.
• Update/Add demo to demonstrate new feature.
• Update TypeScript definition for the component.
• Add unit tests for the feature.

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This change is 

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@9df1930). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3067   +/-   ##
=========================================
  Coverage          ?   60.16%           
=========================================
  Files             ?       92           
  Lines             ?     2249           
  Branches          ?      645           
=========================================
  Hits              ?     1353           
  Misses            ?      887           
  Partials          ?        9

Flag	Coverage Δ
#web	60.16% <ø> (?)

Impacted Files	Coverage Δ
components/toast/index.tsx	3.33% <ø> (ø)

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[doxiaodong]