Make RoomScore derive ScoreInfo

osu.Game/Scoring/ScoreInfo.cs

@@ -98,8 +98,9 @@ public string ModsJson
             }
         }
 
-        [JsonIgnore]
+        [NotMapped]
-        public User User;
+        [JsonProperty("user")]
+        public User User { get; set; }
 
         [JsonIgnore]
         [Column("User")]

osu.Game/Screens/Multi/Match/Components/MatchLeaderboard.cs

@@ -102,20 +102,8 @@ public enum MatchLeaderboardScope
         Overall
     }
 
-    public class RoomScore
+    public class RoomScore : ScoreInfo
     {
-        [JsonProperty("user")]
-        public User User { get; set; }
-
-        [JsonProperty("accuracy")]
-        public double Accuracy { get; set; }
-
-        [JsonProperty("total_score")]
-        public int TotalScore { get; set; }
-
-        [JsonProperty("pp")]
-        public double? PP { get; set; }
-
         [JsonProperty("attempts")]
         public int TotalAttempts { get; set; }