Bug 18673: News author does not display on staff client home page

Bug 18673: News author does not display on staff client home page

News authors do not display on staff client homepage, independently of
syspref 'NewsAuthorDisplay'. This patch fixes the issue.

To verify:
- Create news with display location 'All'
- Set syspref NewsAuthorDisplay to 'Staff client only' or 'Both OPAC and staff client'
- Go to staff client
- Verify that news author does not appear (but it should)

To test:
- Applly patch
- Verify that news author is displayed as expected

Followed test plan works as intended
Signed-off-by: Alex Buckley <alexbuckley@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 151cdcd133d8618a3faf9b47723d66ac3dc71b4e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>