Stops shuttles from bringing background turfs with them. (#15580)

code/modules/security levels/keycard authentication.dm

@@ -3,6 +3,7 @@
 	desc = "This device is used to trigger station functions, which require more than one ID card to authenticate."
 	icon = 'icons/obj/monitors.dmi'
 	icon_state = "auth_off"
+	obj_flags = OBJ_FLAG_MOVES_UNSUPPORTED
 	var/active = 0 //This gets set to 1 on all devices except the one where the initial request was made.
 	var/event = ""
 	var/screen = 1