if amputated full arm or leg, make hand or foot amputated too

code/WorkInProgress/surgery.dm

@@ -959,6 +959,7 @@ proc/spread_germs_to_organ(datum/organ/external/E, mob/living/carbon/human/user)
 		"\blue You have finished adjusting the area around [target]'s [affected.display_name] with \the [tool].")
 		affected.status |= ORGAN_ATTACHABLE
 		affected.amputated = 1
+		affected.setAmputatedTree()
 		affected.open = 0
 
 	fail_step(mob/user, mob/living/carbon/human/target, target_zone, obj/item/tool)

code/datums/organs/organ_external.dm

@@ -322,6 +322,7 @@
 		for(var/datum/organ/external/O in owner.organs)
 			if(O.parent == src)
 				O.amputated=amputated
+				O.setAmputatedTree()
 
 	proc/droplimb(var/override = 0,var/no_explode = 0)
 		if(destspawn) return