Add a keycounter that has been actually used in Triangles skin (#35491)

Author: tadatomix

osu.Game.Tests/Visual/Gameplay/TestSceneSkinnableKeyCounter.cs

@@ -35,7 +35,9 @@ public override void SetUpSteps()
 
         protected override Ruleset CreateRulesetForSkinProvider() => new OsuRuleset();
 
-        protected override Drawable CreateDefaultImplementation() => new ArgonKeyCounterDisplay();
+        protected override Drawable CreateArgonImplementation() => new ArgonKeyCounterDisplay();
+
+        protected override Drawable CreateDefaultImplementation() => new DefaultKeyCounterDisplay();
 
         protected override Drawable CreateLegacyImplementation() => new LegacyKeyCounterDisplay();
     }