Ignore organisation defaults when using "Use Personal Address" for invoicing

Occasionally we have clients whose staff or subbies will book into training directly and be responsible for their own costs.

I have identified that even if we use the "Use Personal Address" setting when going through the workshop booking process, the system still picks up the due date offset from the organisation.

I would suggest if using "Use Personal Address" and thus stripping the invoice of the client details, the invoice should revert to the system default instead of the client default due date offset.

For example, our system default is 7 days, but a client may be 30 days - we do not want the invoice due date for an individual paying to pick up 30 days.