fix: 멤버도메인 머지 오류 수정 (#7)

Author: jbh010204

src/main/java/es/princip/ringus/domain/member/Member.java

@@ -40,9 +40,6 @@ public class Member extends BaseTimeEntity {
 
     private boolean isUniversityVerified;
 
-    @OneToOne(mappedBy = "member", cascade = CascadeType.ALL, orphanRemoval = true)
-    private User user;
-
     public static Member of(
         final String email,
         final String password,