Remove the layout shift when using widgets

[danielbeeke]

One reason for layout shift is the React key that includes the term:

https://github.com/OM-MediaWorks/shacl-form/blob/master/lib/components/field/FieldWrapper.tsx#L180

Each widget should then be hard resetting values. So instead of defaultValue we should be using value and for uHTML we should use .value instead of value.

[danielbeeke]

I was able to do this for most things. There is still some shift happening for BlankNodeEditor.