Some fixes for quickstep when configuration changes

> Creating the launcher animation after first draw, so that the UI is in correct state
> Using correct workspace size, when layout is not valid
> Snapping pagedView to correct page when page size changes
> Resoting to correct workspace page on rebind

Change-Id: I74e61a05aae3a3c4912d4c5c8eb4d5d036d9005a