Fix for internal organ surgery

Fixes internal organ surgery, and some other places where the same
problem would have cropped up

code/game/gamemodes/changeling/changeling_powers.dm

@@ -503,7 +503,7 @@
 				O.wounds = list()
 				O.wound_update_accuracy = 1
 			for(var/organ_name in H.internal_organs)
-				var/datum/organ/internal/IO = H.internal_organs[organ_name]
+				var/datum/organ/internal/IO = H.internal_organs_by_name[organ_name]
 				IO.damage = 0
 				IO.trace_chemicals = list()
 			H.updatehealth()