fix : 그룹 초대 비교 오류 수정

backend/core/src/main/java/site/timecapsulearchive/core/domain/member_group/entity/GroupInvite.java

@@ -51,7 +51,7 @@ public static GroupInvite createOf(Group group, Member groupOwner, Member groupM
     }
 
     public void validateOwner(Long memberId) {
-        if (!groupOwner.equals(memberId)) {
+        if (!groupOwner.getId().equals(memberId)) {
             throw new NoGroupAuthorityException();
         }
     }