refactor : Dto 에서 memberId 제거

Author: luckhee

back/src/main/java/com/back/domain/post/comment/dto/CommentCreateRequest.java

@@ -5,7 +5,6 @@
 
 @Data
 public class CommentCreateRequest {
-    private Long postId;
     private String role;
     @NotBlank(message = "댓글을 입력해주세요")
     private String comment;