fix: calibrate 30minutes event height

[lja1018]

Please check if the PR fulfills these requirements

• It's the right issue type on the title
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• It does not introduce a breaking change or has a description of the breaking change

Description

• calibrate short event with going, coming duration

• AS-IS (30 minutes event with going, coming duration)

• TO-BE

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Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[dotaitch]

리뷰 완료합니다.

[adhrinae]

리뷰 완료합니다.
컨트롤러의 기본값이 최저 높이 설정을 방해하고 있어서 생긴 이슈였나보네요.
최종적으로 지금 버전의 렌더링이 이상이 없는지, 이틀에 걸쳐 going + coming duration 있는 일정들도 렌더링이 잘 되는지만 확인 부탁합니다.