Follow changes for MagneticTarget.Listener to pass the dragged object

Flag: None; bug fix
Test: atest MagnetizedObjectTest MenuViewLayerTest DragToInteractAnimationControllerTest
Test: manual - drag and dismiss bubbles while stack is expanded
                 - drag and dismiss the stack
Bug: 315127709

Change-Id: I74d6711d822ea8873f468b1a4745d45937b81ef9