Tentative Fix/Consistency for Dummy Limb Runtimes (#4805)

# About the pull request

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Tentative fix for a recurring runtime in dummy generation (eg. in
character setup) caused by invalid limbs.
This is also a generally very bad spot in terms of deletions because it
would prevent the organs from deleting properly, and prevent the limbs
from being GC'ed.

As far as I can see only dummy preview and admin transform will cause
cascading species change, so effect might not be obvious.

Tested for basic functionality (dummy render, running around, getting
hit, healing).

# Changelog
:cl:
fix: Fixed Limbs and Organs deleting incorrectly on species change.
/:cl:

code/modules/mob/living/carbon/human/species/species.dm

@@ -133,10 +133,10 @@
 	return
 
 /datum/species/proc/create_organs(mob/living/carbon/human/H) //Handles creation of mob organs and limbs.
-	for(var/L in H.limbs) //In case of pre-existing limbs/organs, we remove the old ones.
-		qdel(L)
-	H.internal_organs = list()
-	H.internal_organs_by_name = list()
+	//In case of pre-existing limbs/organs, we remove the old ones.
+	QDEL_LIST(H.limbs)
+	QDEL_LIST(H.internal_organs)
+	H.internal_organs_by_name.Cut()
 
 	//This is a basic humanoid limb setup.
 	var/obj/limb/chest/C = new(H, null, H)