Options of `CompositeMenuNode` are not actually updated in `updateOptions`

[ndoschek]

Bug Description:

In my use case, I want to reuse the context menu to configure an element.
This is done via a toggleable menu item.
To improve usability, I want to propagate the configuration state to its containing parent submenu by adding an iconClass.
I noticed, that the updateOptions function in the CompositeMenuNode only updates a node's options via the nullish coalescing operator.
As a result, my submenus are not correctly updated if the configuration changes, as the icon option is never reset, even if the updated option object would set the iconClass explicitly to undefined.

I suggest to actually update the options as indicated in the function name, not only if the option values are nullish, do you agree?