Unfucks all the broken vendors that I broke [no gbp] (tgstation#85483)

## About The Pull Request

I broke all the vendors I gotta unbreak them

## Why It's Good For The Game

Fixes tgstation#85477 until I can read through a few thousand lines of code for
vending machines

## Changelog
/:cl:

code/game/machinery/_machinery.dm

@@ -186,7 +186,6 @@
 /obj/machinery/LateInitialize()
 	SHOULD_NOT_OVERRIDE(TRUE)
 	post_machine_initialize()
-	CheckParts()
 
 /obj/machinery/Destroy(force)
 	SSmachines.unregister_machine(src)

code/game/machinery/medipen_refiller.dm

@@ -25,6 +25,7 @@
 	. = ..()
 	AddComponent(/datum/component/plumbing/simple_demand)
 	register_context()
+	CheckParts()
 
 /obj/machinery/medipen_refiller/add_context(atom/source, list/context, obj/item/held_item, mob/user)
 	if(held_item)