Only needs to be cleared once.

No need for the duplicate clearing of this, and quick fix.

Author: rgk

src/input/InputPlugin.js

@@ -1462,7 +1462,7 @@ var InputPlugin = new Class({
             }
 
             // If pointerup is triggered, we have no need for pointerout.
-            this.this._over[pointer.id] = [];
+            this._over[pointer.id] = [];
 
             gameObject.emit(Events.GAMEOBJECT_POINTER_UP, pointer, gameObject.input.localX, gameObject.input.localY, _eventContainer);
 
@@ -1492,8 +1492,6 @@ var InputPlugin = new Class({
             {
                 this.emit(Events.POINTER_UP_OUTSIDE, pointer);
             }
-
-            this.this._over[pointer.id] = [];
         }
 
         return currentlyOver.length;