Use ShortName for mode.

- Also set the ruleset when fetching scores in BeatmapSetOverlay

osu.Game/Online/API/Requests/GetScoresRequest.cs

@@ -69,25 +69,7 @@ namespace osu.Game.Online.API.Requests
                     break;
             }
 
-            switch (ruleset?.Name)
-            {
-                default:
-                case @"osu!":
-                    req.AddParameter(@"mode", @"osu");
-                    break;
-
-                case @"osu!taiko":
-                    req.AddParameter(@"mode", @"taiko");
-                    break;
-
-                case @"osu!catch":
-                    req.AddParameter(@"mode", @"catch");
-                    break;
-
-                case @"osu!mania":
-                    req.AddParameter(@"mode", @"mania");
-                    break;
-            }
+            req.AddParameter(@"mode", ruleset?.ShortName ?? @"osu");
 
             return req;
         }

osu.Game/Overlays/BeatmapSetOverlay.cs

@@ -104,7 +104,7 @@ namespace osu.Game.Overlays
 
             scores.IsLoading = true;
 
-            getScoresRequest = new GetScoresRequest(beatmap);
+            getScoresRequest = new GetScoresRequest(beatmap, beatmap.Ruleset);
             getScoresRequest.Success += r =>
             {
                 scores.Scores = r.Scores;

osu.Game/Screens/Select/Leaderboards/Leaderboard.cs

@@ -289,7 +289,7 @@ namespace osu.Game.Screens.Select.Leaderboards
             {
                 Height = 26;
                 Width = 26;
-                Child = new ClickableContainer
+                Child = new OsuClickableContainer
                 {
                     AutoSizeAxes = Axes.Both,
                     Anchor = Anchor.Centre,