table组件，fix header的时候，scroll-x方向会有两个scrollbar

[hitzzc]

Environment(required)

• antd version:
• OS and its version: OSX
• Browser and its version: chrome

What did you do? Please provide steps to re-produce your problem.

What do you expected?

What happen?

header和body会各有一个scrollbar，请问有什么解决方式么

Re-producible online demo

[yesmeck]

Please provide a re-producible demo: http://codepen.io/benjycui/pen/KgPZrE?editors=001

[afc163]

same as #4637

Sorry, it is a useful style and hard to remove it. I tried removing it at #4637 and intruduce a lot of issues.

[lock]

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