Fix test case and checking en

[owjs3901]

일부 테스트케이스가 이상하던 이슈 수정

영문자인지 아닌지 확인을 영어가 아니면 아니라고 판단했는데, 숫자, 특문 등일 때는 영문 모드가 풀리지 않도록 개선

[changeset-bot]

⚠️ No Changeset found

Latest commit: 28f6aea

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
libs/braillify/src/lib.rs	91.91% <100.00%> (-0.05%)	⬇️
libs/braillify/src/utils.rs	100.00% <100.00%> (ø)

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