Refactor: 공연 장르에 index 삽입

Author: krr3804

src/main/java/com/ticketaka/performance/domain/Performance.java

@@ -28,7 +28,7 @@
 @Builder
 @AllArgsConstructor
 @NoArgsConstructor
-@Table(name = "performance", indexes = @Index(name = "idx_prf_genre", columnList = "prfGenre")) // 장르에다 index 걸기
+@Table(name = "performance", indexes = @Index(name = "idx_prf_genre", columnList = "prf_genre")) // 장르에다 index 걸기
 public class Performance {
     @Id
     @Column(name = "performance_id")