Remove now unnecessary approachcircle proxy disables

Prereqs:
- [ ] ppy/osu-framework#1505

osu.Game.Rulesets.Osu/Edit/OsuEditPlayfield.cs

@@ -7,7 +7,6 @@ namespace osu.Game.Rulesets.Osu.Edit
 {
     public class OsuEditPlayfield : OsuPlayfield
     {
-        protected override bool ProxyApproachCircles => false;
         protected override bool DisplayJudgements => false;
     }
 }

osu.Game.Rulesets.Osu/UI/OsuPlayfield.cs

@@ -21,9 +21,6 @@ public class OsuPlayfield : Playfield
         private readonly JudgementContainer<DrawableOsuJudgement> judgementLayer;
         private readonly ConnectionRenderer<OsuHitObject> connectionLayer;
 
-        // Todo: This should not be a thing, but is currently required for the editor
-        // https://github.com/ppy/osu-framework/issues/1283
-        protected virtual bool ProxyApproachCircles => true;
         protected virtual bool DisplayJudgements => true;
 
         public static readonly Vector2 BASE_SIZE = new Vector2(512, 384);
@@ -59,7 +56,7 @@ public override void Add(DrawableHitObject h)
             h.OnJudgement += onJudgement;
 
             var c = h as IDrawableHitObjectWithProxiedApproach;
-            if (c != null && ProxyApproachCircles)
+            if (c != null)
                 approachCircles.Add(c.ProxiedLayer.CreateProxy());
 
             base.Add(h);