fix(comp:tree): searchKeys is affected by the side effects of other v…

[liuzaijiang]

…ariables

fix #1462

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• [ ] 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?

What is the new behavior?

此issue中的demo由于设置了动态disabled，导致修改到了mergedNodeMap.value值，而searchKeys在computed中被mergedNodeMap.value收集到了依赖，所以更新了searchKeys，进而影响到了expandedKeys； 所以把computed改为watch，使得searchKeys仅被props.searchValue影响

Other information

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Codecov Report

Merging #1483 (b9382af) into main (82ce25b) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b9382af differs from pull request most recent head 0da4641. Consider uploading reports for the commit 0da4641 to get more accurate results

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##             main    #1483   +/-   ##
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  Coverage   92.80%   92.80%           
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  Files         331      331           
  Lines       30661    30661           
  Branches     3527     3527           
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  Hits        28454    28454           
  Misses       2207     2207           

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