[Bug Report] 当tab和固定表头的table一起使用时，切换tab会出现table高度计算错误的情况(表格高度超出范围)
- Dominant language
- Vue
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Description
### Element UI version
2.4.5
### OS/Browsers version
macOS Catalina 10.15.2 / Google Chrome 81.0.4044.122（正式版本） （64 位）
### Vue version
2.6.10
### Reproduction Link
https://codepen.io/pen?__cf_chl_jschl_tk__=e2bd1a98d7c0c42aa982db0a8ff7523669a38841-1587887974-0-ASLCTxtF-7r4Cq3aY0GsGEgvL3khdUnZqCB9egyh4xbX9iUwgRN1g4epLXU5UquxqByoKN_sUR17Bg1xBdXuPvHhgTD1_GrvP9spch0hlCnJjV5T78QycgB6DikspUilaC-3H5Ayx7yEZ3RUAthUfHXZhYbckyx-vK-83HRuZQGkblJ8fK97xUksHdXfumkOcV3r9MSfe3RnjHTdr4gwvLL8sNOy01tqnd9yThOdqThby5AwnAUJgPLK81D_u3SYP3YYsCh0bfm0oTUDwF7FX1MbvLi7fI75PraJ48IewtT80QVOwStKKvICw1WPUtdwNFz-LJUluu02N3mhWP_j-Po
### Steps to reproduce
点击tab切换 table高度计算错误，超出范围
### What is Expected?
高度保持不变
### What is actually happening?
table高度超出
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