[client] wayland: free presentation objects

Since the display server owns a graph, it was necessary to move the overlay
graphs destruction so that it happens after display server destruction.

client/displayservers/Wayland/wayland.c

@@ -130,6 +130,7 @@ static void waylandFree(void)
 {
   waylandIdleFree();
   waylandWindowFree();
+  waylandPresentationFree();
   waylandInputFree();
   waylandOutputFree();
   waylandRegistryFree();