wayland: Don't destroy the cairo surface when resizing it

The code in GDK is incredibly broken and nobody is quite sure what's
right-side-up and what's upside down, but this breaks mutter-wayland
now, so let's remove it. It might leak, but we should probably do a
full restructuring of GDK drawing to fix it.

gdk/wayland/gdkwindow-wayland.c

@@ -1488,8 +1488,6 @@ gdk_window_wayland_resize_cairo_surface (GdkWindow       *window,
                                          gint             height)
 {
   /* cairo image surfaces cannot be resized */
-  cairo_surface_destroy (surface);
-
   return NULL;
 }