Bug 26847: Add UI test for categorycode in masthead

Bug 26847: Add UI test for categorycode in masthead

This test adds a regression test for the addition of categorycode
into the masthead of the staff client.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 69bf6e80cf4c35601dbeea871c973c7ce3997e41)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit fac4d77e12b3e843d115fd596bd3923a4918719a)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>