Changed conditions on which wounds bleed.

It was 'any wound with damage over 4', which caused even lighter burns to bleed.
Now it's either cuts or bruises with over 20 damage (if you got hit with so much force SOME skin is bound to tear there, I think).

code/datums/organs/organ_external.dm

@@ -169,7 +169,7 @@
 			else if(W.damage_type == BURN)
 				burn_dam += W.damage
 
-			if(!W.bandaged && W.damage > 4)
+			if(!W.bandaged && (W.damage_type == CUT || W.damage_type == BRUISE && W.damage >=20))
 				status |= ORGAN_BLEEDING
 
 			number_wounds += W.amount
@@ -585,7 +585,7 @@ obj/item/weapon/organ/head/proc/transfer_identity(var/mob/living/carbon/human/H)
 	if(H.mind)
 		H.mind.transfer_to(brainmob)
 	brainmob.container = src
-    
+
 obj/item/weapon/organ/head/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(istype(W,/obj/item/weapon/scalpel))
 		switch(brain_op_stage)