Fix hit object placement not receiving input when outside playfield

The input area is vertical infinite, but horizontally restricted to the playfield due to `CatchPlayfield`'s `ReceivePositionalInputAt` override.

osu.Game.Rulesets.Catch/Edit/Blueprints/CatchPlacementBlueprint.cs

@@ -6,6 +6,7 @@
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.UI;
 using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
 
 namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 {
@@ -23,5 +24,7 @@ public CatchPlacementBlueprint()
             : base(new THitObject())
         {
         }
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => true;
     }
 }