wayland: Let shell surface role sync generic window state

Instead of having each final role do the same call, lets just make the
common role object deal with synchronizing window buffer size.

https://bugzilla.gnome.org/show_bug.cgi?id=769936

src/wayland/meta-wayland-xdg-shell.c

@@ -432,8 +432,6 @@ xdg_surface_role_commit (MetaWaylandSurfaceRole  *surface_role,
   if (!window)
     return;
 
-  meta_wayland_surface_apply_window_state (surface, pending);
-
   if (pending->has_new_geometry)
     {
       /* If we have new geometry, use it. */
@@ -606,7 +604,6 @@ xdg_popup_role_commit (MetaWaylandSurfaceRole  *surface_role,
   if (!window)
     return;
 
-  meta_wayland_surface_apply_window_state (surface, pending);
   meta_wayland_surface_calculate_window_geometry (surface, &geom, 0, 0);
   meta_window_wayland_move_resize (window,
                                    NULL,