submenu on table filter does not work well

[rqzheng2015]

Environment(required)

• antd version:2.7.2
• OS and its version:macOS 10.12.3
• Browser and its version:Chrome v56

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

I tested the demo table on https://ant.design/components/table/ , and found out that submenu on filter options did not work as expected

What do you expected?

make the filter submenu visible.

What happen?

Style is not as expected.

Re-producible online demo

https://ant.design/components/table/

[afc163]

Style breaks after #4916

[lock]

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