fix: text-area default rows

[1587315093]

#6249

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6255.surge.sh

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5892da7) 90.85% compared to head (c5a0d5b) 90.85%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6255   +/-   ##
=======================================
  Coverage   90.85%   90.85%           
=======================================
  Files         305      305           
  Lines        6602     6605    +3     
  Branches     1640     1640           
=======================================
+ Hits         5998     6001    +3     
  Misses        559      559           
  Partials       45       45           

Impacted Files	Coverage Δ
src/components/text-area/text-area.tsx	100.00% <100.00%> (ø)

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