TabBar에 Mission 부분 이미지에 문제가 생겨 안보이는 오류를 수정합니다. <img width="525" alt="스크린샷 2024-07-11 오전 10 57 54" src="https://github.com/Stack-Knowledge/Stack-Knowledge-iOS-v2/assets/102593699/d71767e2-746e-40fe-9965-a5d474bf50c9"> <img width="349" alt="스크린샷 2024-07-11 오전 10 59 51" src="https://github.com/Stack-Knowledge/Stack-Knowledge-iOS-v2/assets/102593699/50b2b5f7-80b3-4c67-b0d6-608156c7a14e">
