EE3: Fix missing fields in the CSV export when using regional managers.

[sethshoultes]

Codebase ticket:
https://events.codebasehq.com/projects/event-espresso/tickets/10555

Testing notes:
https://events.codebasehq.com/projects/event-espresso/tickets/10555#update-40937356

Work done on - BUG-10555-fix-regional-man-export

I've sent a copy of these changes over to Greg for him to test with regional managers but its working locally for me.

To test first add a couple of registrations that have coupon codes (and don't), both paid and unpaid registrations to 'your' event as a regional manager (with Roles and Permissions Pro)

Export the CSV as a regional manager and just check the it looks correct, specifically the price, coupon and qty columns but a sweep over them all would be good.

Now repeat the export as a Admin. Check the CSV looks correct.

De-activate the R&P add-ons and export as an Admin, check the CSV looks correct.

The main thing to check is that everything works as expected as an admin with the CSV. Regional managers have been broken a long time.

That's it, Bobs your uncle!