chore: code style simplify

[1587315093]

把 if 语法风格统一了一下，只有一行代码的省略了花括号

删了一些时间久的注释属性

简化了一下箭头函数的 return

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6241.surge.sh

[zombieJ]

if 的不要挪掉哈，这样会让覆盖率看起来很高实际上代码没跑到。箭头函数优化可以留~

[afc163]

原来的写法是更好的格式。

[1587315093]

嗦嘎~

[codecov]

Codecov Report

Patch coverage: 90.00% and project coverage change: +0.27 🎉

Comparison is base (2a78b4b) 90.75% compared to head (716a9db) 91.03%.

Additional details and impacted files

@@             Coverage Diff             @@
##           feature    #6241      +/-   ##
===========================================
+ Coverage    90.75%   91.03%   +0.27%     
===========================================
  Files          305      305              
  Lines         6601     6583      -18     
  Branches      1644     1643       -1     
===========================================
+ Hits          5991     5993       +2     
+ Misses         562      544      -18     
+ Partials        48       46       -2     

Impacted Files	Coverage Δ
src/components/dropdown/dropdown.tsx	86.44% <ø> (ø)
src/components/form/form-array.tsx	26.66% <ø> (ø)
src/components/popover/popover.tsx	92.85% <0.00%> (+1.30%)	⬆️
...c/components/date-picker/date-picker-date-utils.ts	90.90% <83.33%> (+0.39%)	⬆️
src/components/capsule-tabs/capsule-tabs.tsx	97.91% <100.00%> (+1.99%)	⬆️
...c/components/date-picker-view/date-picker-view.tsx	100.00% <100.00%> (+60.00%)	⬆️
...c/components/date-picker/date-picker-week-utils.ts	93.05% <100.00%> (-0.28%)	⬇️
src/components/footer/footer.tsx	100.00% <100.00%> (ø)
src/components/image-uploader/image-uploader.tsx	93.89% <100.00%> (-0.05%)	⬇️
src/components/modal/modal.tsx	100.00% <100.00%> (ø)
... and 4 more

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[1587315093]

将 if 语句的修改的去掉了

保留了函数的那些

@afc163 @zombieJ