Rework mod applications to hitobject/rulesetcontainer for DifficultyCalculator

osu.Game/Beatmaps/DifficultyCalculator.cs

@@ -49,6 +49,10 @@ namespace osu.Game.Beatmaps
             var clock = new StopwatchClock();
             mods.OfType<IApplicableToClock>().ForEach(m => m.ApplyToClock(clock));
 
+            foreach (var mod in mods.OfType<IApplicableToHitObject<T>>())
+                foreach (var obj in Objects)
+                    mod.ApplyToHitObject(obj);
+
             TimeRate = clock.Rate;
         }