Keep same content color of List like previous version

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

👻 What's the background?

1. Describe the source of requirement, like related issue link.

close #15296

2. Describe the problem and the scenario.

• 3.14.1: https://codesandbox.io/s/xp32603nkp
• 3.15.1: https://codesandbox.io/s/57q64141k

💡 Solution

Add text color to content.

📝 Changelog description

Describe changes from user side, and list all potential break changes or other risks.

1. English description

• Keep same content color of List like previous version. 3.15.0 List: style problem when setting itemLayout="vertical" #15296

2. Chinese description (optional)

☑️ Self Check before Merge

• 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

[codecov]

Codecov Report

Merging #15301 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15301      +/-   ##
==========================================
+ Coverage   94.13%   94.15%   +0.01%     
==========================================
  Files         250      250              
  Lines        6635     6635              
  Branches     1906     1906              
==========================================
+ Hits         6246     6247       +1     
+ Misses        388      387       -1     
  Partials        1        1

Impacted Files	Coverage Δ
components/upload/UploadList.tsx	94.49% <0%> (-1.84%)	⬇️
components/_util/wave.tsx	87.5% <0%> (+2.88%)	⬆️

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