fix(comp:table): tree cell with no siblings should show indent line

[sallerli1]

PR Checklist

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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?

表格组件，当一个树节点没有下个兄弟节点，且该树节点被展开时，其子节点行与该节点对应的缩进位置依然展示了连线

What is the new behavior?

修复以上问题，只有当某个节点有兄弟节点时，其下方才应当有连线

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1735 (732c713) into main (873d214) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 732c713 differs from pull request most recent head cf12322. Consider uploading reports for the commit cf12322 to get more accurate results

@@           Coverage Diff           @@
##             main    #1735   +/-   ##
=======================================
  Coverage   92.31%   92.31%           
=======================================
  Files         346      346           
  Lines       32781    32783    +2     
  Branches     3704     3704           
=======================================
+ Hits        30261    30263    +2     
  Misses       2520     2520           

Files	Coverage Δ
packages/components/table/src/types.ts	100.00% <100.00%> (ø)