clients/presentation-shm: Bind to xdg_wm_base version 1

It was binding to any advertised version, but it can't actually work with version 4 (because it doesn't handle the new configure_bounds event).

Other sample clients in the tree are hard-coding version 1, so do the same here.

Fixes: 6d9fda71 ("clients/presentation-shm: use xdg_shell instead of wl_shell")