Fix multiple animation inconsistencies pointed out in review

Author: peppy

osu.Game.Rulesets.Osu/Skinning/Argon/ArgonReverseArrow.cs

@@ -104,9 +104,9 @@ protected override void Update()
                 main.Scale = new Vector2(Interpolation.ValueAt(loopCurrentTime, scale_amount, 1f, move_out_duration, move_out_duration + move_in_duration, Easing.Out));
 
             if (loopCurrentTime < move_out_duration)
-                side.X = Interpolation.ValueAt(loopCurrentTime, 1, move_distance, 0, move_out_duration, Easing.Out);
+                side.X = Interpolation.ValueAt(loopCurrentTime, 0, move_distance, 0, move_out_duration, Easing.Out);
             else
-                side.X = Interpolation.ValueAt(loopCurrentTime, move_distance, 1f, move_out_duration, move_out_duration + move_in_duration, Easing.Out);
+                side.X = Interpolation.ValueAt(loopCurrentTime, move_distance, 0, move_out_duration, move_out_duration + move_in_duration, Easing.Out);
         }
     }
 }

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyReverseArrow.cs

@@ -96,9 +96,16 @@ protected override void Update()
 
                 double loopCurrentTime = (Time.Current - drawableRepeat.AnimationStartTime.Value) % duration;
 
+                // Reference: https://github.com/peppy/osu-stable-reference/blob/2280c4c436f80d04f9c79d3c905db00ac2902273/osu!/GameplayElements/HitObjects/Osu/HitCircleSliderEnd.cs#L79-L96
                 if (shouldRotate)
+                {
                     arrow.Rotation = Interpolation.ValueAt(loopCurrentTime, rotation, -rotation, 0, duration);
-                arrow.Scale = new Vector2(Interpolation.ValueAt(loopCurrentTime, 1.3f, 1, 0, duration));
+                    arrow.Scale = new Vector2(Interpolation.ValueAt(loopCurrentTime, 1.3f, 1, 0, duration));
+                }
+                else
+                {
+                    arrow.Scale = new Vector2(Interpolation.ValueAt(loopCurrentTime, 1.3f, 1, 0, duration, Easing.Out));
+                }
             }
         }