fix(segmented-control): fix the styling of SegmentedControlItem's content area

[sungik-choi]

Self Checklist

• I wrote a PR title in English.
• I added an appropriate label to the PR.
• I wrote a commit message in English.
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• I added the appropriate changeset for the changes.
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Related Issue

None

Summary

SegmentedControlItem 의 컨텐츠 영역 스타일링을 올바르게 수정합니다.

Details

• 사이드 컨텐츠가 가로축을 기준으로 정렬되도록 수정
• 사이드 컨텐츠가 인디케이터에 의해 가려지지 않도록 수정

Breaking change or not (Yes/No)

No

References

None

[changeset-bot]

🦋 Changeset detected

Latest commit: a45f663

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@channel.io/bezier-react	Patch
bezier-figma-plugin	Patch

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9c40d79) 84.25% compared to head (a45f663) 84.25%.

Additional details and impacted files

@@           Coverage Diff            @@
##           next-v1    #1343   +/-   ##
========================================
  Coverage    84.25%   84.25%           
========================================
  Files          309      309           
  Lines         3919     3919           
  Branches       804      804           
========================================
  Hits          3302     3302           
  Misses         546      546           
  Partials        71       71           

Impacted Files	Coverage Δ
...ts/Forms/SegmentedControl/SegmentedControlItem.tsx	100.00% <ø> (ø)
.../Forms/SegmentedControl/SegmentedControl.styled.ts	100.00% <100.00%> (ø)

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[github-actions]

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