fix: not remove touchstart listenr before unmount

[linxianxi]

No description provided.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
virtual-list	❌ Failed (Inspect)			Jul 10, 2023 9:53am

[codecov]

Codecov Report

Merging #206 (9c6dfd6) into master (884060e) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 9c6dfd6 differs from pull request most recent head 5be5e83. Consider uploading reports for the commit 5be5e83 to get more accurate results

@@            Coverage Diff            @@
##            master      #206   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          483       483           
  Branches        94        94           
=========================================
  Hits           483       483           

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

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