chore: Java 스타일 수정

Author: github-actions

backend/src/main/java/io/f1/backend/domain/game/store/RoomRepository.java

@@ -1,6 +1,5 @@
 package io.f1.backend.domain.game.store;
 
-import io.f1.backend.domain.game.model.Player;
 import io.f1.backend.domain.game.model.Room;
 
 import java.util.List;

backend/src/main/java/io/f1/backend/domain/game/store/RoomRepositoryImpl.java

@@ -1,6 +1,5 @@
 package io.f1.backend.domain.game.store;
 
-import io.f1.backend.domain.game.model.Player;
 import io.f1.backend.domain.game.model.Room;
 
 import org.springframework.stereotype.Repository;