Fix cast exception when dropping widgets to a drop target

When inflating a widget directly in the DragView, I've overridden
the layout param to FrameLayout.LayoutParam. Before drag complete,
we should restore the previous layout param.

Test: Drag a widget to a drop target. No crash is observed.
Bug: 186111130
Change-Id: Ifd33d57a886496ab31d4e741870b0ae18ca9ce4e
1 file changed