wayland: Avoid rearranging layer surfaces when wl_surface size changes

wl_surface size is not used when re-arranging surfaces. It also results in
excessive configure events.

Note that it can be useful for updating strut rects, but we could use the
next geometry, which is even preferrable over the frame geometry as the
Workspace would use proper struts earlier.


(cherry picked from commit 648cfcd6)