fix(UI): select svg icon size

[evenchange4]

Issue:

What I did

How to test

[michaelhsu-bot]

	Warnings
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Deploy preview for mcs-lite-ui ready!

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Deploy preview for mcs-lite-introduction ready!

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Deploy preview for mcslite ready!

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[codecov[bot]]

Codecov Report

Merging #596 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #596   +/-   ##
======================================
  Coverage    84.4%   84.4%           
======================================
  Files         319     319           
  Lines        2648    2648           
  Branches      169     169           
======================================
  Hits         2235    2235           
  Misses        352     352           
  Partials       61      61

Impacted Files	Coverage Δ
...ckages/mcs-lite-ui/src/Select/styled-components.js	100% <100%> (ø)	:arrow_up:

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