Update EquipmentContainer.java

Fixed small bug where you have a stackable weapon equipped and in your inventory (i.e. darts/knifes/etc) and you equip a non-stackable item (i.e. whip, scimitar, etc), the stackable item will be unequipped to a separate slot than the slot already containing the stackable item (i.e. you will have two slots with the same stackable inventory).