fix(export): export corner bug

[YardWill]

👀 PR includes

✨ Feature

• New feature

🎨 Enhance

• Code style optimization
• Refactoring
• Change the UI
• Improve the performance
• Type optimization

🐛 Bugfix

• Solve the issue and close 🐛导出组件功能，导出文件表头缺失 #854

🔧 Chore

• Test case
• Docs / demos update
• CI / workflow
• Release version
• Other ()

📝 Description

🖼️ Screenshot

Before	After
❌	✅

🔗 Related issue link

🔍 Self Check before Merge

• Add or update relevant Docs.
• Add or update relevant Demos.
• Add or update relevant TypeScript definitions.

[github-actions]

🎊 PR Preview has been successfully built and deployed to https://s2-preview-pr-856.surge.sh

[github-actions]

Size Change: +165 B (0%)

Total Size: 185 kB

Filename	Size	Change
./packages/s2-core/dist/index.min.js	113 kB	+165 B (0%)

ℹ️ View Unchanged

Filename	Size
./packages/s2-core/dist/style.min.css	356 B
./packages/s2-react/dist/index.min.js	68.5 kB
./packages/s2-react/dist/style.min.css	3.1 kB

_{compressed-size-action}

[lgtm-com]

This pull request fixes 2 alerts when merging 2963b78 into 025ec55 - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[github-actions]

你好, @YardWill CI 执行失败, 请点击 [Details] 按钮查看, 并根据日志修复。

Hello, @YardWill CI run failed, please click the [Details] button try to fixed it.

[lgtm-com]

This pull request fixes 2 alerts when merging 6d06e90 into 025ec55 - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[codecov]

Codecov Report

Merging #856 (5fff592) into master (114e7fc) will increase coverage by 0.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #856      +/-   ##
==========================================
+ Coverage   71.41%   71.42%   +0.01%     
==========================================
  Files         168      168              
  Lines       11734    11753      +19     
  Branches     2743     2747       +4     
==========================================
+ Hits         8380     8395      +15     
- Misses       2206     2207       +1     
- Partials     1148     1151       +3     

Impacted Files	Coverage Δ
packages/s2-core/src/utils/export/index.ts	68.57% <92.85%> (+1.03%)	⬆️

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[lgtm-com]

This pull request fixes 2 alerts when merging 8defa4a into 114e7fc - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request fixes 2 alerts when merging 5fff592 into 114e7fc - view on LGTM.com

fixed alerts:

• 2 for Unused variable, import, function or class

[github-actions]

🎉 This PR is included in version @antv/s2-v1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀