fix: treeNode dataRef is undefined

[zkwolf]

First of all, thank you for your contribution! 😄

New feature please send pull request to feature branch, and rest to master branch.
Pull request will be merged after one of collaborators approve.
Please makes sure that these form are filled before submitting your pull request, thank you!

[中文版模板 / Chinese template]

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

1. Describe the source of requirement.
   In merge commit 00f1047, treeselect lose props treeData, it cause that treeNode.dataRef is undefined and treeselect can't dynamic load data.

2. Resolve what problem.
3. Related issue link.

API Realization (Optional if not new feature)

1. Basic thought of solution and other optional proposal.
2. List final API realization and usage sample.
3. GIF or snapshot should be provided if includes UI/interactive modification.

What's the effect? (Optional if not new feature)

1. Does this PR affect user? Which part will be affected?
2. What will say in changelog?
3. Does this PR contains potential break change or other risk?

Changelog description (Optional if not new feature)

1. English description
2. Chinese description (optional)

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

Additional Plan? (Optional if not new feature)

If this PR related with other PR or following info. You can type here.

[netlify]

Deploy preview for ant-desing-vue processing.

Building with commit 5f9ebe8

https://app.netlify.com/sites/ant-desing-vue/deploys/5d5cf2b52f6b310008fbefa7

[codecov]

Codecov Report

Merging #1111 into feat-1.4.0 will increase coverage by <.01%.
The diff coverage is 75%.

@@              Coverage Diff               @@
##           feat-1.4.0    #1111      +/-   ##
==============================================
+ Coverage       87.62%   87.62%   +<.01%     
==============================================
  Files             155      155              
  Lines            5358     5359       +1     
  Branches         1590     1591       +1     
==============================================
+ Hits             4695     4696       +1     
  Misses            591      591              
  Partials           72       72

Impacted Files	Coverage Δ
components/tree-select/index.jsx	79.24% <75%> (+0.39%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f66fae4...5f9ebe8. Read the comment docs.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.