fix(tree): tree组件样式问题

[huskylengcb]

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[codecov]

Codecov Report

Merging #991 (c98ca0f) into master (543f1ef) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #991   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          151       151           
  Lines         4873      4873           
  Branches      1217      1217           
=========================================
  Hits          4873      4873           

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