Bug 34375: Fix the option to provide no fund in budget dropdown

Bug 34375: Fix the option to provide no fund in budget dropdown

Currently it is not possible to use the No fund option as the dropwdown will default to the first budget in the list. This patch re-adds this option so that the defaulting behaviour is fixed

Test plan:
1) Go to a vendor record in Acquisitions and then Receive Shipment
2) Enter an invoice number
3) Leave the Shipping cost empty and Shipping Fund as 'No fund'
4) Receive some orders or go straight to Finish receiving
5) Notice the Shipping fund has defaulted to the first fund in the alphabetical list of funds.  It is not possible to select 'No fund' and the selected fund is recorded in shipmentcost_budgetid incorrectly.
6) Apply patch
7) Repeat steps 1-5 and this time the No fund option should be used correctly

Signed-off-by: Georgia Newman <g.newman@arts.ac.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>