Use actual sliderends dropped instead of estimating

Score data for non-CL scores includes sliderends dropped, meaning no need to estimate.

CL scores are still estimated.

osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs

@@ -21,6 +21,7 @@ public class OsuPerformanceCalculator : PerformanceCalculator
         private int countOk;
         private int countMeh;
         private int countMiss;
+        private int countSliderEndsDropped;
 
         private double effectiveMissCount;
 
@@ -39,6 +40,7 @@ protected override PerformanceAttributes CreatePerformanceAttributes(ScoreInfo s
             countOk = score.Statistics.GetValueOrDefault(HitResult.Ok);
             countMeh = score.Statistics.GetValueOrDefault(HitResult.Meh);
             countMiss = score.Statistics.GetValueOrDefault(HitResult.Miss);
+            countSliderEndsDropped = score.Statistics.GetValueOrDefault(HitResult.SmallTickMiss);
             effectiveMissCount = calculateEffectiveMissCount(osuAttributes);
 
             double multiplier = PERFORMANCE_BASE_MULTIPLIER;
@@ -123,7 +125,11 @@ private double computeAimValue(ScoreInfo score, OsuDifficultyAttributes attribut
             if (attributes.SliderCount > 0)
             {
                 double estimateSliderEndsDropped = Math.Clamp(Math.Min(countOk + countMeh + countMiss, attributes.MaxCombo - scoreMaxCombo), 0, estimateDifficultSliders);
-                double sliderNerfFactor = (1 - attributes.SliderFactor) * Math.Pow(1 - estimateSliderEndsDropped / estimateDifficultSliders, 3) + attributes.SliderFactor;
+                double sliderNerfFactor = 0;
+                if (!score.Mods.Any(h => h is OsuModClassic cl && cl.NoSliderHeadAccuracy.Value))
+                    sliderNerfFactor = (1 - attributes.SliderFactor) * Math.Pow(1 - countSliderEndsDropped / estimateDifficultSliders, 3) + attributes.SliderFactor;
+                else
+                    sliderNerfFactor = (1 - attributes.SliderFactor) * Math.Pow(1 - estimateSliderEndsDropped / estimateDifficultSliders, 3) + attributes.SliderFactor;
                 aimValue *= sliderNerfFactor;
             }