style(icon): update icon default size units rem to px

[LEEHONCN]

affects: @gio-design/icons

@gio-design/icons@20.11.1

图标默认尺寸单位rem更新为px

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@gio-design/icons@20.11.1

update icon default size units rem to px

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[codecov]

Codecov Report

Merging #525 (b4f7ddb) into master (3ae7744) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #525   +/-   ##
=======================================
  Coverage   78.45%   78.45%           
=======================================
  Files         123      123           
  Lines        3968     3968           
  Branches     1031     1031           
=======================================
  Hits         3113     3113           
  Misses        848      848           
  Partials        7        7           

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