fix: fix focus

[yoyo837]

ref: #671

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (67baccb) 99.58% compared to head (4f140f8) 99.30%.

Files	Patch %	Lines
src/Menu.tsx	66.66%	1 Missing ⚠️
src/hooks/useAccessibility.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #679      +/-   ##
==========================================
- Coverage   99.58%   99.30%   -0.28%     
==========================================
  Files          27       27              
  Lines         718      722       +4     
  Branches      193      194       +1     
==========================================
+ Hits          715      717       +2     
- Misses          3        5       +2     

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[yoyo837]

我调试发现在 antd 的 test case 中，用例失败是因为 focus 的时候 li 没有宽高，认为 unfocusable 然后 filter 掉了 ， 而 rc-menu 的用例始终成功是用例运行时，li 有宽高，是 focusable 的