[#26] Disabled LinkField class's save logic

[jakxnz]

#26

[elliot-sawyer]

Thanks for this @jakxnz !

I think there's a bigger issue here - why is LinkField not saving properly using the methods inherited from FormField? I'm not sure that telling LinkField to never save into a DataObject is the best solution. I agree with @GuySartorelli, we need some better reproduction steps.

That aside, I can't merge this in until the conflicts are resolved