Cleanbots destroy cigarette butts (#3279)

## About The Pull Request

Cleanbots now shoot acid at cigarette butts like they do to normal
trash. Increased the amount of acid cleanbots shoot out by an amount so
the trash actually gets destroyed.

## Why It's Good For The Game

To restore order in a ship full of smokers

## Changelog

:cl:
add: Cleanbots now destroy cigarette butts, and dispense enough acid to
do so.
/:cl:

code/modules/mob/living/simple_animal/bot/cleanbot.dm

@@ -235,6 +235,9 @@
 	if(!target && trash) //Then for trash.
 		target = scan(/obj/item/trash)
 
+	if(!target && trash) //Then for Chainsmokers.
+		target = scan(/obj/item/cigbutt)
+
 	if(!target && trash) //Search for dead mices.
 		target = scan(/obj/item/reagent_containers/food/snacks/deadmouse)
 
@@ -317,6 +320,7 @@
 		target_types += list(
 		/obj/item/trash,
 		/obj/item/reagent_containers/food/snacks/deadmouse,
+		/obj/item/cigbutt,
 		)
 
 	target_types = typecacheof(target_types)
@@ -340,7 +344,7 @@
 	else if(istype(A, /obj/item) || istype(A, /obj/effect/decal/remains))
 		visible_message("<span class='danger'>[src] sprays hydrofluoric acid at [A]!</span>")
 		playsound(src, 'sound/effects/spray2.ogg', 50, TRUE, -6)
-		A.acid_act(75, 10)
+		A.acid_act(100, 10)
 		target = null
 	else if(istype(A, /mob/living/simple_animal/hostile/cockroach) || istype(A, /mob/living/simple_animal/mouse))
 		var/mob/living/simple_animal/M = target