revert overwriting Position getter in SliderTailCircle

It would have very weird implications when combined with the position bindable which would be all wrong and stuff

osu.Game.Rulesets.Osu/Objects/Slider.cs

@@ -218,6 +218,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                         {
                             RepeatIndex = e.SpanIndex,
                             StartTime = e.Time,
+                            Position = EndPosition,
                             StackHeight = StackHeight,
                             ClassicSliderBehaviour = ClassicSliderBehaviour,
                         });
@@ -244,6 +245,9 @@ namespace osu.Game.Rulesets.Osu.Objects
 
             if (HeadCircle != null)
                 HeadCircle.Position = Position;
+
+            if (TailCircle != null)
+                TailCircle.Position = EndPosition;
         }
 
         protected void UpdateNestedSamples()

osu.Game.Rulesets.Osu/Objects/SliderTailCircle.cs

@@ -1,11 +1,9 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using osu.Game.Rulesets.Judgements;
 using osu.Game.Rulesets.Osu.Judgements;
 using osu.Game.Rulesets.Scoring;
-using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Objects
 {
@@ -17,12 +15,6 @@ namespace osu.Game.Rulesets.Osu.Objects
         /// </summary>
         public bool ClassicSliderBehaviour;
 
-        public override Vector2 Position
-        {
-            get => Slider.EndPosition;
-            set => throw new NotImplementedException();
-        }
-
         public SliderTailCircle(Slider slider)
             : base(slider)
         {