Lowers zombie infection chance when hit (BeeStation#10544)

* infection chance

* Ratón fucked up

* Forgive my stupidity

* Document.

* Auto something idk

code/modules/zombie/items.dm

@@ -12,6 +12,8 @@
 	var/icon_right = "bloodhand_right"
 	hitsound = 'sound/hallucinations/growl1.ogg'
 	force = 21 // Just enough to break airlocks with melee attacks
+	/// Base infection chance of 80%, gets lowered with armour
+	var/base_infection_chance = 80
 	damtype = BRUTE
 
 /obj/item/zombie_hand/Initialize(mapload)
@@ -37,7 +39,7 @@
 			var/flesh_wound = ran_zone(user.get_combat_bodyzone(target))
 			if(H.check_shields(src, 0))
 				return
-			if(prob(100-H.getarmor(flesh_wound, MELEE, armour_penetration)))
+			if(prob(base_infection_chance-H.getarmor(flesh_wound, MELEE, armour_penetration)))
 				try_to_zombie_infect(target)
 		else
 			check_feast(target, user)