The time left on a shuttle call/recall modifies with security level. (#21906)

* The time left on a shuttle call/recall will now correctly modify with changes in the alert status.

As added functionality Code Green shuttle calls no longer need a reason (though you can still give one) and take 20 minutes to arrive.

* Takes out the fun part (for now)

code/modules/shuttle/shuttle.dm

@@ -602,6 +602,14 @@
 	timer = world.time + wait
 	last_timer_length = wait
 
+/obj/docking_port/mobile/proc/modTimer(multiple)
+	var/time_remaining = timer - world.time
+	if(time_remaining < 0 || !last_timer_length)
+		return
+	time_remaining *= multiple
+	last_timer_length *= multiple
+	setTimer(time_remaining)
+
 /obj/docking_port/mobile/proc/invertTimer()
 	if(!last_timer_length)
 		return