[fix] useRef에서 startTime.current 프로퍼티 누락 오류 수정#408

seongwon030 merged 2 commits intodevelop-feMoadong/moadong:develop-fefrom

fix/#407-useref-start-time-current-FE-115Moadong/moadong:fix/#407-useref-start-time-current-FE-115Copy head branch name to clipboard