container.Base: createItem() => removes default values

the check if an item has a module => removing the ntype and vice versa is getting applied to the itemDefaults object, so it will affect all following items.

we need to change this behavior to only change a shallow copy.

@Dinkh: this explains why window actions not always show up. the toolbar spacer is a module: Component, removes the default button ntype, actions become components and the styling is lost.