Revert "gdk/wayland: Avoid idempotent wl_subsurface.set_position calls"

This reverts commit 8aa6d59b7a.

This caused a regression in totem that still needs to be investigated.

https://bugzilla.gnome.org/show_bug.cgi?id=784314

gdk/wayland/gdkwindow-wayland.c

@@ -2663,8 +2663,7 @@ gdk_window_wayland_move_resize (GdkWindow *window,
   if (with_move)
     {
       /* Each toplevel has in its own "root" coordinate system */
-      if (GDK_WINDOW_TYPE (window) != GDK_WINDOW_TOPLEVEL &&
-          (window->x != x || window->y != y))
+      if (GDK_WINDOW_TYPE (window) != GDK_WINDOW_TOPLEVEL)
         {
           window->x = x;
           window->y = y;