Bug 33457: Improve display of fund users when the patron has no firstname

Bug 33457: Improve display of fund users when the patron has no firstname

This patch updates the way the fund modification page handles patron
names so that a patron with only a first name or only a surname will
have their name appear correctly when selected as a manager or a user.

To test, apply the patch if necessary, create a patron with only a first
name and one with only a surname and give them acquisitions permissions.

- Go to Administration -> Funds.
- Edit a fund.
- Click 'Add users'.
- Select a user, only staff users will be searchable
- Select one of the patrons you created.
  - The patron name should appear correctly
  - Test with both your first name only patron and your last name only
    patron.
- Perform the same test with the 'Select owner' process.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 00ed806d204f60acb419052f177001d5a76b1310)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>