fix having inapropriate ammo in CL lockbox. (#4071)

# About the pull request
fixes: #3976
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# Explain why it's good for the game
removing the improper ammo in the lock box because it's obsolete
considering the new gun CL as.
adding a way to buy more ammo so that CL as a way to refill is weapon.
didn't wanted to give it for free in the lockbox.
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>


![image](https://github.com/cmss13-devs/cmss13/assets/117036822/f9aeb4e9-e11f-4a3f-9ccd-da244ee74713)


![image](https://github.com/cmss13-devs/cmss13/assets/117036822/815b6f6a-0532-4beb-9a68-7c524ead3eb1)


Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
balance: adding the possibility to buy "ES-4 stun magazine" for 10 point
in the portable vendor.
fix: remove a bunch of ammo that where improper for ES-4 gun that are in
the lockbox.
/:cl:

---------

Co-authored-by: Julien <[email protected]>

code/game/objects/items/devices/portable_vendor.dm

@@ -270,4 +270,7 @@
 
 		list("MISC", 0, null, null, null),
 		list("Hollow Cane", 15, /obj/item/weapon/pole/fancy_cane/this_is_a_knife, "white", "A hollow cane that can store any commonplace sharp weaponry. Said weapon not included."),
+
+		list("AMMO", 0, null, null, null),
+		list("ES-4 stun magazine", 10, /obj/item/ammo_magazine/pistol/es4, "white", "Holds 19 rounds of specialized Conductive 9mm."),
 	)

code/game/objects/items/storage/lockbox.dm

@@ -54,11 +54,9 @@
 	req_access = list(ACCESS_WY_CORPORATE)
 
 /obj/item/storage/lockbox/loyalty/fill_preset_inventory()
-	new /obj/item/ammo_magazine/pistol/mod88(src)
-	new /obj/item/ammo_magazine/pistol/mod88(src)
-	new /obj/item/ammo_magazine/pistol/mod88/rubber(src)
-	new /obj/item/ammo_magazine/pistol/mod88/rubber(src)
-
+	new /obj/item/ammo_magazine/pistol/es4(src)
+	new /obj/item/ammo_magazine/pistol/es4(src)
+	new /obj/item/ammo_magazine/pistol/es4(src)
 
 /obj/item/storage/lockbox/cluster
 	name = "lockbox of cluster flashbangs"