set new_client flag on xwl clients during swap

this forces another run of client placement so that xwl clients do
not always appear at 0,0

src/bin/e_comp_x.c

@@ -5483,6 +5483,7 @@ e_comp_x_xwayland_client_setup(E_Client *ec, E_Client *wc)
    e_object_del(E_OBJECT(ec));
    e_hints_window_visible_set(wc);
    _e_comp_x_client_stack(wc);
+   wc->new_client = 1;
 }
 #endif