fix: checkboxPrefixCls less var naming

[afc163]

[codecov[bot]]

Codecov Report

Merging #259 (820eded) into master (dd4ea3c) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 820eded differs from pull request most recent head 5fd238d. Consider uploading reports for the commit 5fd238d to get more accurate results

@@            Coverage Diff            @@
##            master      #259   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           29        29           
  Branches         5         5           
=========================================
  Hits            29        29           

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