fix(icons): uppercase filename icons

[fz6m]

这里要解的一个问题是，如果用户使用了 中横线 - + 大写字母 的文件名，会报错。

但所有的云 icon 是没有这个问题的，因为云 icon 都是小写的。

fix #10920

cc @xiaohuoni

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
umi	⬜️ Ignored (Inspect)			Apr 17, 2023 0:59am

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (db3a325) 29.23% compared to head (b8c67f9) 29.23%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10988   +/-   ##
=======================================
  Coverage   29.23%   29.23%           
=======================================
  Files         478      478           
  Lines       14352    14352           
  Branches     3379     3379           
=======================================
  Hits         4196     4196           
  Misses       9431     9431           
  Partials      725      725           

Impacted Files	Coverage Δ
packages/preset-umi/src/features/icons/icons.ts	0.00% <ø> (ø)
packages/preset-umi/src/features/icons/svgr.ts	0.00% <0.00%> (ø)

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