fix(date-picker):fix format type processing for showTime.

[Zian502]

[中文版模板 / Chinese template]

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🔗 Related issue link

💡 Background and solution

fix #44275

📝 Changelog

Language	Changelog
🇺🇸 English	fix(date-picker):fix showTime work error when format is Array
🇨🇳 Chinese	修复 date-picker 组件，当 showTime 为 true 且 format 为数组时，组件报错

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

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---

🚀 Summary

🤖 Generated by Copilot at e4124ab

Fix date picker time format bug when format prop is an array. Use the first element of the array as the time picker format in components/date-picker/util.ts.

🔍 Walkthrough

🤖 Generated by Copilot at e4124ab

• Fix date picker time format bug when format prop is an array (link)

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[github-actions]

[Zian502]

#44275

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Aug 22, 2023, 4:09 AM

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (06d1c9a) 100.00% compared to head (16d118e) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44306   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          660       660           
  Lines        11228     11230    +2     
  Branches      3038      3039    +1     
=========================================
+ Hits         11228     11230    +2     

Files Changed	Coverage Δ
components/date-picker/util.ts	100.00% <100.00%> (ø)

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