fix: form-item line-height

[yiyunwan]

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@967a72f). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8 +/- ## ========================================== Coverage ? 100.00% ========================================== Files ? 1 Lines ? 43 Branches ? 20 ========================================== Hits ? 43 Misses ? 0 Partials ? 0 ```

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