Feat: DBs can be holstered (#554)

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## Что этот PR делает
Добавляет возможность убрать в кобуру обрез двустволки и самострела
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## Почему это хорошо для игры
Бафф бармена миноров и ассистух
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## Изображения изменений

![донхтру3](https://github.com/ss220club/Paradise-SS220/assets/108077473/a4ab0007-4855-4e9d-825a-d3f5bedb94c5)

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## Тестирование
Протестировано и работает как часы
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## Changelog
:cl:
add: Добавлена возможность прятать sawn-off double-barreled shotgun и
sawn-off improvised shotgun в кобуру
/:cl:

modular_ss220/balance/_balance.dm

@@ -1,4 +1,4 @@
 /datum/modpack/balance
 	name = "Баланс"
 	desc = "Твики баланса."
-	author = "dj-34, larentoun"
+	author = "dj-34, larentoun, Yata9arasu"

modular_ss220/balance/code/items/weapons.dm

@@ -1,2 +1,7 @@
 /obj/item/melee/baton/cattleprod
 	w_class = WEIGHT_CLASS_NORMAL
+/obj/item/gun/projectile/revolver/doublebarrel/sawoff(mob/user)
+	. = ..()
+	if(sawn_state == SAWN_OFF)
+		can_holster = TRUE
+		w_class = WEAPON_MEDIUM