当修改滚动条样式后，table组件表头有滚动列，导致样式异常

[kangxiaoxiao]

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Version

v3.2.20

Environment

chrome

Reproduction link

Steps to reproduce

1、设置了scroll.y 2、设置了全局滚动条样式 3、表格的高度<最大可滚动高度

What is expected?

表头中没有类型为ant-table-cell-scrollbar的th标签

What is actually happening?

表头中有滚动列标签，视觉上表头最后一列与主体没有对齐

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