* Causes the proxy to return to its position of origin via an animation. Should be called after an\r
* invalid drop operation by the item being dragged.\r
* @param {Array} xy The XY position of the element ([x, y])\r
* Causes the proxy to return to its position of origin via an animation. Should be called after an\r
* invalid drop operation by the item being dragged.\r
* @param {Array} xy The XY position of the element ([x, y])\r