refactor: 중복 코드 제거

Author: leebs0521

src/test/java/com/somemore/recruitboard/service/command/UpdateRecruitBoardServiceTest.java

@@ -156,7 +156,6 @@ void updateRecruitBoardWhenCenterIdIsWrong() {
     void updateRecruitBoardStatus() {
         // given
         Long recruitBoardId = recruitBoard.getId();
-        UUID centerId = recruitBoard.getCenterId();
         RecruitStatus newStatus = RecruitStatus.CLOSED;
         LocalDateTime currentDateTime = createCurrentDateTime();