Fix wrong surface positioning when animating a split pair to home

Use the screen based position instead of parent-relative position to
make sure the surface was placing at the expected position while
animation apps to home.

Bug: 273685456
Test: http://recall/-/fLARJNt42LVxc3tt86SneW/c2pLS6FwyEMweiLiWqqzPa
Change-Id: Iea79e6d2b9ab591fe18c5ac7a0d89bb90a461145