connection: Print object id for new-id arguments in deubug output

connection: Print object id for new-id arguments in deubug output

We can't use the same behaviour in both the client and the server.  In the
client this is a wl_proxy pointer in the server it's a pointer to the
uint32_t object id.  This doesn't fix the problem, but it's a slightly
more useful default, since we typically use WAYLAND_DEBUG on the client.