Anchor component with affix=true doesn't work inside inner scrollable…

[vitaliymaz]

… container #11687

First of all, thank you for your contribution! :-)

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

• Make sure that you propose PR to right branch: bugfix for master, feature for latest active branch feature-x.x.
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Extra checklist:

if isBugFix :

• Make sure that you add at least one unit test for the bug which you had fixed.

elif isNewFeature :

• Update API docs for the component.
• Update/Add demo to demonstrate new feature.
• Update TypeScript definition for the component.
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[ant-design-bot]

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Built with commit 6a14248

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[codecov]

Codecov Report

Merging #11688 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #11688      +/-   ##
==========================================
- Coverage   92.03%   91.99%   -0.04%     
==========================================
  Files         200      200              
  Lines        5109     5109              
  Branches     1433     1433              
==========================================
- Hits         4702     4700       -2     
- Misses        403      405       +2     
  Partials        4        4

Impacted Files	Coverage Δ
components/anchor/Anchor.tsx	90.9% <100%> (ø)	⬆️
components/affix/index.tsx	87.5% <0%> (-1.67%)	⬇️

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