Keep Fields on Request Details even when de-activated from space

If the field was in the space when that request was submitted, it should be stored and visible on the request details to be able to still adjust or manually 0 out if needed.

Right now, when you remove a field from the space, you are no longer able to see the field or adjust it unless you re-add the field back to the space. This becomes a problem if the field has costs, because when the invoice gets created, that field is brought onto the invoice, but you cannot see it on the request.