Syndicate bombs use world.time; explode faster

🆑 coiax
add: Syndicate bombs now use world.time to track their countdowns, the
same as shuttles and dominators. They will now explode slightly sooner
when a red button is pressed.
/🆑

- Syndicate bombs fast process so they can beep every second. It's
syncronised with the observer countdown for extra drama.
- As a balance change, this means that bombs have effectively a 25-50%
faster minimum timer.

code/modules/countdown/countdown.dm

@@ -70,7 +70,7 @@
 	if(!istype(S))
 		return
 	else if(S.active)
-		return S.timer
+		return S.seconds_remaining()
 
 /obj/effect/countdown/nuclearbomb
 	name = "nuclear bomb countdown"