Fixed inventory button not updating when window was closed (#304)

* Fixed inventory button not updating when window was closed

* Only add the event handler once

* uhhhh

* UHHHHHH

Content.Client/GameObjects/Components/HUD/Inventory/HumanInventoryInterfaceController.cs

@@ -43,7 +43,7 @@ namespace Content.Client.GameObjects
             base.Initialize();
 
             _window = new HumanInventoryWindow(_loc, _resourceCache);
-
+            _window.OnClose += () => GameHud.InventoryButtonDown = false;
             foreach (var (slot, button) in _window.Buttons)
             {
                 button.OnPressed = AddToInventory;