fix(TreeSelect): 修复过滤后无法选中问题

[Banana-energy]

修复过滤后无法选中问题

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#887

💡 需求背景和解决方案

在搜索框失去焦点后将搜索方法置为null，导致tree-select组件刷新

📝 更新日志

• fix(TreeSelect): 修复过滤后无法选中问题

• 本条 PR 不需要纳入 Changelog

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⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
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[codecov-commenter]

Codecov Report

Merging #1008 (e53c17d) into develop (a0db0df) will increase coverage by 2.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1008      +/-   ##
===========================================
+ Coverage    57.56%   59.59%   +2.03%     
===========================================
  Files          346      382      +36     
  Lines        12828    14637    +1809     
  Branches      2405     2747     +342     
===========================================
+ Hits          7384     8723    +1339     
- Misses        5200     5646     +446     
- Partials       244      268      +24     

Impacted Files	Coverage Δ
src/affix/affix.tsx	28.57% <0.00%> (-37.51%)	⬇️
src/swiper/props.ts	68.75% <0.00%> (-31.25%)	⬇️
src/dialog/props.ts	70.00% <0.00%> (-30.00%)	⬇️
src/calendar/props.ts	70.00% <0.00%> (-30.00%)	⬇️
src/popup/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/select/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/slider/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/message/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/tooltip/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/pagination/props.ts	75.00% <0.00%> (-25.00%)	⬇️
... and 160 more

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[github-actions]

[xiaosansiji]

这样修改有个问题，过滤没命中选项的时候，失去焦点时没办法自动清掉了，这时候用户除了刷新页面没办法再重置下拉框里过滤的结果内容，可以看下预览页面的操作：https://preview-pr1008-tdesign-vue.surge.sh/vue/components/tree-select

[Banana-energy]

那在focus方法中将 filterByText 方法置为null呢，在失去焦点后重新点击时就可以刷新组件了

[xiaosansiji]

fixed in: #1027