fix: ConfigProvider with nest prefixCls

[zombieJ]

🤔 This is a ...

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

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix nest ConfigProvider missing prefixCls value.
🇨🇳 Chinese	修复嵌套 ConfigProvider 会丢失 prefixCls 值的问题。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[tests-checker]

Could you please add tests to make sure this change works as expected?

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 4d6eabf:

Sandbox	Source
antd reproduction template	Configuration

[ant-design-bot]

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 8c8a5e2:

Sandbox	Source
antd reproduction template	Configuration

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 18b2f21:

Sandbox	Source
antd reproduction template	Configuration

[codecov]

Codecov Report

Merging #23423 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #23423   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         364      364           
  Lines        7314     7316    +2     
  Branches     1956     1957    +1     
=======================================
+ Hits         7203     7205    +2     
  Misses        111      111           

Impacted Files	Coverage Δ
components/config-provider/context.tsx	100.00% <100.00%> (ø)
components/config-provider/index.tsx	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fc98ab7...09d24af. Read the comment docs.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 09d24af:

Sandbox	Source
antd reproduction template	Configuration