♻️ test code 빌더 수정

Author: sehee123

backend/src/test/java/io/f1/backend/domain/game/app/RoomServiceTests.java

@@ -174,7 +174,7 @@ private User createUser(int i) {
 
         User user = User.builder()
             .provider(provider)
-            .provider(providerId).lastLogin(lastLogin).build();
+            .providerId(providerId).lastLogin(lastLogin).build();
         user.setId(userId);
 
         return user;