Fix critical failure causing scores to not update on the leaderboard

osu.Game/Screens/Play/HUD/MultiplayerGameplayLeaderboard.cs

@@ -71,11 +71,19 @@ namespace osu.Game.Screens.Play.HUD
 
                     UserScores[user.Id] = trackedUser;
                 }
-
-                prepareDataStreams();
             }));
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            // this is *required* to be here due to the spectator leaderboard not correctly populating clocks if done later.
+            // note that running this here is probably not 100% correct (if a user quits before user population occurs for instance,
+            // an incorrect state will be reached).
+            prepareDataStreams();
+        }
+
         private void prepareDataStreams()
         {
             // BindableList handles binding in a really bad way (Clear then AddRange) so we need to do this manually..