view: Unify view_move()/view_move_resize()

view: Unify view_move()/view_move_resize()

view->impl->move() is a specific case of view->impl->configure().
To reduce code duplication, we can use view->impl->configure() for
pure moves (without resize) as well.

xwayland's move() function also possibly contained a race condition
when there was a pending resize, as it used the current surface
width/height rather than the pending width/height. This is fixed.