x11/foot: unbreak build after aec9c6c9cf90

../wayland.c:655:17: error: enumeration value 'XDG_TOPLEVEL_STATE_SUSPENDED' not handled in switch [-Werror,-Wswitch]

switch (*state) {
        ^

PR: 272372
(cherry picked from commit bcea2e3a260297c7127041c29a166ab447feabb0)