Fix incorrect thread usage of ruleset in tournament `DataLoadTest`

osu.Game.Tournament.Tests/NonVisual/DataLoadTest.cs

@@ -35,9 +35,9 @@ public void TestUnavailableRuleset()
 
         public class TestTournament : TournamentGameBase
         {
-            [BackgroundDependencyLoader]
-            private void load()
+            protected override void LoadComplete()
             {
+                base.LoadComplete();
                 Ruleset.Value = new RulesetInfo(); // not available
             }
         }