Fix bug with loadout items replacing properties of similar job items (#3674)

## About The Pull Request

Loadout equipping code checks mob equipment when running `on_equip_item`
which would normally be fine because it eventually loops to the items in
the case but if a job has the same type path as something in the
loadout, say `/obj/item/clothing/head/beret` in the loadout and
`/obj/item/clothing/head/beret/blueshield` in the job, it'll apply the
loadout prefs to the job item because that's earlier in the list and
that can break shit

## Why It's Good For The Game

Fixes #3667 

## Proof Of Testing
<details>
<summary>Screenshots/Videos</summary>


![image](https://github.com/user-attachments/assets/da7df967-6cc6-463e-a2b1-ab5553e9bf0f)

</details>

## Changelog
🆑
fix: fixed loadout item customization breaking job equipment under
certain circumstances
/🆑

code/modules/loadout/loadout_helpers.dm

@@ -76,7 +76,7 @@
 	var/update = NONE
 	for(var/datum/loadout_item/item as anything in loadout_datums)
 		update |= item.on_equip_item(
-			equipped_item = locate(item.item_path) in new_contents,
+			equipped_item = loadout_placement_preference == LOADOUT_OVERRIDE_CASE ? locate(item.item_path) in travel_suitcase : locate(item.item_path) in new_contents, // BUBBER EDIT CHANGE - ORIGINAL: equipped_item = locate(item.item_path) in new_contents,
 			preference_source = preference_source,
 			preference_list = preference_list,
 			equipper = src,