fix: non-draggable-node-allow-drop

[berber1016]

问题详情请参加此issue，当某个节点的 draggable 属性设置为 false 时，该节点应该可以作为一个 有效的放置放置目标。

[vercel[bot]]

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Name	Status	Preview	Comments	Updated
tree	❌ Failed (Inspect)			Mar 8, 2023 at 7:10AM (UTC)

[codecov[bot]]

Codecov Report

Merging #731 (aa3e99f) into master (62e0bf0) will decrease coverage by 0.01%. The diff coverage is n/a.

:exclamation: Current head aa3e99f differs from pull request most recent head ecb8951. Consider uploading reports for the commit ecb8951 to get more accurate results

@@            Coverage Diff             @@
##           master     #731      +/-   ##
==========================================
- Coverage   99.67%   99.67%   -0.01%     
==========================================
  Files          11       11              
  Lines        1245     1240       -5     
  Branches      349      352       +3     
==========================================
- Hits         1241     1236       -5     
  Misses          4        4              

Impacted Files	Coverage Δ
src/TreeNode.tsx	100.00% <ø> (ø)

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