Clear home surface crop size while being organized

Launcher has the surface size set as its display bounds before
entering split-screen. Since the crop size was not updated while
being organized, the surface was then cropped after rotation.

Bug: 152515401
Test: move app to split-screen-primary and rotate
Change-Id: I41237f21f188b0d2cf92c93873a3c76be3e4cb74