fix(comp:textarea): fix line-height to ensure height calculation

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added/updated or not needed
• [x] Docs and demo have been added/updated or not needed

What is the current behavior?

多行文本的行高与实际行高不一致，导致文字与行标不对其

What is the new behavior?

修复以上问题

Other information

[idux-bot[bot]]

This preview will be available after the AzureCI is passed.

[codecov[bot]]

Codecov Report

Merging #1214 (cca62c9) into next (3924fbd) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             next    #1214      +/-   ##
==========================================
- Coverage   92.66%   92.66%   -0.01%     
==========================================
  Files         316      316              
  Lines       29033    29036       +3     
  Branches     2371     3259     +888     
==========================================
+ Hits        26903    26905       +2     
- Misses       2130     2131       +1     

Impacted Files	Coverage Δ
packages/pro/textarea/src/ProTextarea.tsx	34.54% <0.00%> (-0.22%)	:arrow_down:
packages/pro/textarea/src/token.ts	100.00% <0.00%> (ø)

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