session-lock: add missing lock_surface_destroy

Add the missing lock_surface_destroy which was removed in dc7686c114
("session-lock: don't remove inert role resource"). Otherwise we never
remove the surface from our internal state, leading to us killing the
locking daemon with a protocol error that is totally our fault.

types/wlr_session_lock_v1.c

@@ -189,6 +189,7 @@ static void lock_surface_role_destroy(struct wlr_surface *surface) {
 	if (lock_surface == NULL) {
 		return;
 	}
+	lock_surface_destroy(lock_surface);
 }
 
 static const struct wlr_surface_role lock_surface_role = {