Fixes healing nanites

Fixes Accelerated Regeneration, Bio Regen, and Mechanical.

Also changed one line on Exo nanites but it doesn't fix those.  Dunno what to do.

code/modules/research/nanites/nanite_programs/healing.dm

@@ -23,7 +23,7 @@
 		if(!parts.len)
 			return
 		for(var/obj/item/bodypart/L in parts)
-			if(L.heal_damage(0.5/parts.len, 0.5/parts.len, null, BODYPART_ORGANIC))
+			if(L.heal_damage(0.5/parts.len, 0.5/parts.len))
 				host_mob.update_damage_overlays()
 	else
 		host_mob.adjustBruteLoss(-0.5, TRUE)
@@ -136,7 +136,7 @@
 			return
 		var/update = FALSE
 		for(var/obj/item/bodypart/L in parts)
-			if(L.heal_damage(1.5/parts.len, 1.5/parts.len, null, BODYPART_ROBOTIC)) //much faster than organic healing
+			if(L.heal_damage(1.5/parts.len, 1.5/parts.len, only_robotic = TRUE, only_organic = FALSE)) //much faster than organic healing
 				update = TRUE
 		if(update)
 			host_mob.update_damage_overlays()
@@ -180,7 +180,7 @@
 			return
 		var/update = FALSE
 		for(var/obj/item/bodypart/L in parts)
-			if(L.heal_damage(3/parts.len, 3/parts.len, null, BODYPART_ORGANIC))
+			if(L.heal_damage(3/parts.len, 3/parts.len, FALSE))
 				update = TRUE
 		if(update)
 			host_mob.update_damage_overlays()

code/modules/research/nanites/nanite_programs/utility.dm

@@ -241,7 +241,7 @@
 	for(var/mob/living/L in oview(5, host_mob))
 		if(!prob(25))
 			continue
-		if(!(L.mob_biotypes & (MOB_ORGANIC|MOB_UNDEAD)))
+		if(!(MOB_ORGANIC in L.mob_biotypes) && !(MOB_UNDEAD in L.mob_biotypes))
 			continue
 		target_hosts += L
 	if(!target_hosts.len)