chore: Java 스타일 수정

Author: github-actions

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

@@ -15,7 +15,6 @@
 import io.f1.backend.domain.user.entity.User;
 import io.f1.backend.global.util.SecurityUtils;
 
-import java.util.Collections;
 import lombok.extern.slf4j.Slf4j;
 
 import org.junit.jupiter.api.AfterEach;
@@ -31,6 +30,7 @@
 
 import java.time.LocalDateTime;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
 import java.util.concurrent.CountDownLatch;
@@ -144,7 +144,8 @@ void exitRoom_synchronized() throws Exception {
             executorService.submit(
                     () -> {
                         try {
-                            UserPrincipal principal = new UserPrincipal(user, Collections.emptyMap());
+                            UserPrincipal principal =
+                                    new UserPrincipal(user, Collections.emptyMap());
                             SecurityUtils.setAuthentication(user);
                             log.info("room.getHost().getId() = {}", room.getHost().getId());
                             roomService.exitRoom(roomId, sessionId, principal);