fix(pro:transfer): overide transfer tree node selected bg color

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

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

What is the current behavior?

树穿梭框的节点选中之后（不是勾选，是点击）背景颜色不正常

What is the new behavior?

内部覆盖掉选中样式解决以上问题

Other information

右边的删除图标背景是必须的，在存在横向滚动时删除图标固定在右边，需要背景颜色遮挡下方文字

[idux-bot]

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[codecov]

Codecov Report

Merging #1407 (dbe6b13) into main (5d604f9) will not change coverage.
The diff coverage is n/a.

❗ Current head dbe6b13 differs from pull request most recent head 8725d6a. Consider uploading reports for the commit 8725d6a to get more accurate results

@@           Coverage Diff           @@
##             main    #1407   +/-   ##
=======================================
  Coverage   92.90%   92.90%           
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  Files         325      325           
  Lines       29930    29930           
  Branches     2495     2495           
=======================================
  Hits        27805    27805           
  Misses       2125     2125           

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