[bug report] El caster the display style of the option that is disabled by default and checked by default is incorrect
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- Dominant language
- Vue
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Description
### Element UI version
2.15.0
### OS/Browsers version
win 10 / Google Chrome 94.0.4606.71 （64 位）
### Vue version
2.6.10
### Reproduction Link
https://codepen.io/chixiaoxiao/pen/jOLPGdW
### Steps to reproduce
三级的列表的可以默认展示父级的勾选
四级的列表，勾选没有了。
### What is Expected?
四级的列表也有勾选
### What is actually happening?
四级的没有列表勾选
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