Merge pull request #164 from Team-INSERT/feat/#163

대회 권한 핸들링 수정

src/main/java/com/insert/ioj/domain/contest/domain/Contest.java

@@ -34,7 +34,7 @@ public Contest(String title, LocalDateTime startTime, LocalDateTime endTime, Aut
     }
 
     public void checkRole(Authority authority) {
-        if (authority == Authority.USER) return;
+        if (this.authority == Authority.USER) return;
         if (this.authority == authority) return;
         if (this.authority == Authority.ADMIN) return;