Fixes synths and sets null post-load prefs

Fixes digestion button missing, and synths overheating in a belly, and synth custom species

code/modules/organs/robolimbs.dm

@@ -6,8 +6,7 @@ var/datum/robolimb/basic_robolimb
 	basic_robolimb = new()
 	for(var/limb_type in typesof(/datum/robolimb))
 		var/datum/robolimb/R = new limb_type()
-		if(!R.unavailable_to_produce) //VOREStation Edit
-			all_robolimbs[R.company] = R
+		all_robolimbs[R.company] = R
 		if(!R.unavailable_at_chargen)
 			chargen_robolimbs[R.company] = R
 

code/modules/organs/robolimbs_vr.dm

@@ -8,4 +8,4 @@
 	icon = 'icons/mob/human_races/cyberlimbs/kitsuhana.dmi'
 	includes_tail = 1
 	unavailable_to_produce = 1
-	//unavailable_at_chargen = 1
+	unavailable_at_chargen = 1