Hide unobtainable ckey-locked loadout items again (#3814)

## About The Pull Request

I unhid ckey-locked and donor-locked items in #3747, but it's been
expressed that people don't want to see items they'll never be able to
obtain, so this re-hides them (while still keeping donor-locked ones
visible, so people can see what they'll be getting if they donate)

## Why It's Good For The Game

Hide items you'll never be able to use

## Proof Of Testing

Tested both with and without having a ckey-locked item for my ckey

## Changelog
🆑
qol: ckey-locked loadout items that you can't obtain are hidden again
/🆑

code/modules/loadout/loadout_items.dm

@@ -347,6 +347,7 @@ GLOBAL_LIST_INIT(all_loadout_categories, init_loadout_categories())
 	formatted_item["reskins"] = get_reskin_options()
 	formatted_item["icon"] = ui_icon
 	formatted_item["icon_state"] = ui_icon_state
+	formatted_item["ckey_whitelist"] = ckeywhitelist // BUBBER EDIT ADDITION: Filter ckey-locked items
 
 	return formatted_item
 

code/modules/loadout/loadout_menu.dm

@@ -113,6 +113,7 @@
 /datum/preference_middleware/loadout/get_ui_static_data(mob/user)
 	var/list/data = list()
 	data["loadout_preview_view"] = preferences.character_preview_view.assigned_map
+	data["ckey"] = user.ckey // BUBBER EDIT ADDITION: Filter ckey-locked items
 	return data
 
 /datum/preference_middleware/loadout/get_constant_data()