fix(demo): optimize fetchData for table

[thinkasany]

中文版模板 / Chinese template

🤔 This is a ...

• Demo update

🔗 Related issue link

close #48550

💡 Background and solution

第一次请求会修改total，会造成重复请求

📝 Changelog

Language	Changelog
🇺🇸 English	fix(demo): optimize fetchData for table
🇨🇳 Chinese	fix(demo): 优化table网络请求的demo

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• 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

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[github-actions]

👁 Visual Regression Report for PR #48560 Passed ✅

🎯 Target branch: master (0bc2e3a)
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0bc2e3a) to head (5a18c05).

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #48560   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          744       744           
  Lines        12887     12887           
  Branches      3371      3371           
=========================================
  Hits         12887     12887           

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