adds a tactical nail gun to CE’s vendor (#7426)

# About the pull request

adds a tactical nail gun to CE’s vendor.

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# Explain why it's good for the game
CE should have one of these already, CE’s not having sentries is
understandable but they should have basic tools available to them.
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

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

</details>


# Changelog
:cl:
balance: The Tactical compact nail gun is now available in the Chief
Engineers vendor.
/:cl:

code/game/machinery/vending/vendor_types/crew/senior_officers.dm

@@ -90,6 +90,7 @@ GLOBAL_LIST_INIT(cm_vending_clothing_chief_engineer, list(
 		list("Marine Combat Boots", 0, /obj/item/clothing/shoes/marine, MARINE_CAN_BUY_SHOES, VENDOR_ITEM_MANDATORY),
 		list("Welding Goggles", 0, /obj/item/clothing/glasses/welding, MARINE_CAN_BUY_GLASSES, VENDOR_ITEM_MANDATORY),
 		list("KN5500/2 PDA", 0, /obj/item/device/working_joe_pda/uscm, MARINE_CAN_BUY_KIT, VENDOR_ITEM_MANDATORY),
+		list("Tactical Compact Nailgun", 0, /obj/item/weapon/gun/smg/nailgun/compact/tactical, MARINE_CAN_BUY_KIT, VENDOR_ITEM_MANDATORY),
 
 		list("UNIFORM (CHOOSE 1)", 0, null, null, null),
 		list("Chief Engineer Uniform", 0, /obj/item/clothing/under/marine/officer/ce, MARINE_CAN_BUY_UNIFORM, VENDOR_ITEM_RECOMMENDED),