fix: form-item line-height

[yiyunwan]

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What have you changed?

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[codecov]

Codecov Report

❗ 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

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

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