Adds a trailing comma to some lists, cleans up cargo cult static vars (#94770)

## About The Pull Request

Tin, some global lists being kept in memory for no reason when all they
are used for is initially picking a random reagent from a list.

## Changelog

Nothing player-facing, just code janitoring.

code/modules/bitrunning/objects/gimmick_disks/dungeon_disk.dm

@@ -30,8 +30,9 @@
 	name = "unlabeled bottle"
 	desc = "A small bottle. You don't remember what you put in it."
 
+/obj/item/reagent_containers/cup/bottle/alchemist_basic/add_initial_reagents()
 	/// List of possible reagents we may pick from
-	var/static/list/possible_reagents = list(
+	var/list/possible_reagents = list(
 		/datum/reagent/aluminium, // Basic chems
 		/datum/reagent/bromine,
 		/datum/reagent/carbon,
@@ -63,7 +64,6 @@
 		/datum/reagent/consumable/coffee,
 	)
 
-/obj/item/reagent_containers/cup/bottle/alchemist_basic/add_initial_reagents()
 	var/our_reagent = pick(possible_reagents)
 	reagents.add_reagent(our_reagent, 50)