[#297] rename(TicketRepositoryCustomImpl): 클래스명 변경

src/main/java/com/beat/domain/booking/dao/TicketRepositoryImpl.java → src/main/java/com/beat/domain/booking/dao/TicketRepositoryCustomImpl.java

@@ -18,7 +18,7 @@
 
 @Repository
 @RequiredArgsConstructor
-public class TicketRepositoryImpl implements TicketRepositoryCustom {
+public class TicketRepositoryCustomImpl implements TicketRepositoryCustom {
 
 	private final JPAQueryFactory queryFactory;