Fixes some shielded component jank (#79674)

## About The Pull Request

If you attempted to use the shielded component properly (applying it in
`Init`), it would not work because the equipped signal was improperly
passing its arguments to `set_wearer`.

The only reason why this worked now is that every consumer added the
component after it was `equipped`... usually in `equipped`.

This also meant shielded items that added it in equipped were open to an
exploit, allowing you to reset the charges by unequip / re-equip.

## Changelog

🆑 Melbert
fix: Fixes some potential exploits and issues involving shielded
equipment.
/🆑

code/modules/capture_the_flag/ctf_equipment.dm

@@ -207,12 +207,18 @@
 	var/lose_multiple_charges = TRUE
 	var/show_charge_as_alpha = TRUE
 
-/obj/item/clothing/suit/armor/vest/ctf/equipped(mob/user, slot)
+/obj/item/clothing/suit/armor/vest/ctf/Initialize(mapload)
 	. = ..()
-	if(!slot || slot & ITEM_SLOT_HANDS)
-		return
-	AddComponent(/datum/component/shielded, max_charges = max_charges, recharge_start_delay = recharge_start_delay, charge_increment_delay = charge_increment_delay, \
-	charge_recovery = charge_recovery, lose_multiple_charges = lose_multiple_charges, show_charge_as_alpha = show_charge_as_alpha, shield_icon = team_shield_icon)
+	AddComponent( \
+		/datum/component/shielded, \
+		max_charges = max_charges, \
+		recharge_start_delay = recharge_start_delay, \
+		charge_increment_delay = charge_increment_delay, \
+		charge_recovery = charge_recovery, \
+		lose_multiple_charges = lose_multiple_charges, \
+		show_charge_as_alpha = show_charge_as_alpha, \
+		shield_icon = team_shield_icon, \
+	)
 
 // LIGHT SHIELDED VEST