fix: duplicated selected menu item when selectedKeys is string

[afc163]

close ant-design/ant-design#29429

[codecov]

Codecov Report

Merging #374 (27427a3) into master (8085da9) will decrease coverage by 0.09%.
The diff coverage is 97.77%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   95.73%   95.64%   -0.10%     
==========================================
  Files          11       11              
  Lines         915      919       +4     
  Branches      271      274       +3     
==========================================
+ Hits          876      879       +3     
- Misses         39       40       +1     

Impacted Files	Coverage Δ
src/utils/legacyUtil.ts	100.00% <ø> (ø)
src/SubPopupMenu.tsx	95.83% <92.85%> (-0.58%)	⬇️
src/DOMWrap.tsx	83.45% <100.00%> (ø)
src/Menu.tsx	98.12% <100.00%> (ø)
src/MenuItem.tsx	100.00% <100.00%> (ø)
src/MenuItemGroup.tsx	100.00% <100.00%> (ø)
src/SubMenu.tsx	98.27% <100.00%> (ø)
src/util.ts	100.00% <100.00%> (ø)

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