Bug 25763: Allow updating of order fund from invoice

Bug 25763: Allow updating of order fund from invoice

To test:
 1 - Receive some orders via acquisitions
 2 - View the invoice with these orders
 3 - Click 'Modify fund' on the received orders list
 4 - Confirm you can change the fund
 5 - Set some authorised value categories for funds
 6 - Reload the invoice
 7 - Confirm the categories dropdowns change when different funds selected
 8 - Confirm updating the statistic fields saves correctly
 9 - Add an inactive budget with some funds
10 - Test the 'show inactive' button on shipment fund, adjustments, and modifying order fund

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>