refactor: 重构表单收缩部分代码 (#2124)

[wjc112233]

trafficstars

原先的代码逻辑是把isAdvanced属性添加在每一个schema上（详见useAdvanced.ts的updateAdvanced方法），这种直接修改计算属性的方式本身就不规范，而且会导致如果schemas这个数组被更新后，每个schema上的isAdvanced属性就丢失了，页面会出现闪烁的情况。

具体可以看 "组件/Table/开启搜索区域"这个页面，就是因为schemas被重新设置了之后，导致出现闪烁的情况。

此次修改的代码范围小，应该不会产生什么副作用。

General

✏️ Mark the necessary items without changing the structure of the PR template.

• [x] Pull request template structure not broken

Type

ℹ️ What types of changes does your code introduce?

👉 Put an x in the boxes that apply

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist

ℹ️ Check all checkboxes - this will indicate that you have done everything in accordance with the rules in CONTRIBUTING.

👉 Put an x in the boxes that apply.

• [x] My code follows the style guidelines of this project
• [x] Is the code format correct
• [x] Is the git submission information standard?
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules