fix: resolve styling issue for checkbox when disabled

[ruibaby]

What type of PR is this?

/area ui /kind bug /milestone 2.17.x

What this PR does / why we need it:

修复 FormKit 中当 checkbox 为 disabled 时的样式问题。

before:

after:

Does this PR introduce a user-facing change?

None

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.17%. Comparing base (bc10336) to head (0fdd42c). Report is 51 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6240 +/- ## ============================================ + Coverage 54.51% 57.17% +2.66% - Complexity 3523 3720 +197 ============================================ Files 646 648 +2 Lines 21862 21979 +117 Branches 1528 1538 +10 ============================================ + Hits 11917 12566 +649 + Misses 9328 8803 -525 + Partials 617 610 -7 ```

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[f2c-ci-robot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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Needs approval from an approver in each of these files: - ~~[ui/OWNERS](https://github.com/halo-dev/halo/blob/main/ui/OWNERS)~~ [JohnNiang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment