Bug 26847: Add data-categorycode to opac pages

Bug 26847: Add data-categorycode to opac pages

This patch adds the data-categorycode attribute to the loggedinuser span
for all pages in the opac.

Test plan
1/ Apply first patch, varify unit test fails.
2/ Apply second patch, varify unit test now passes.
3/ Navigate to opac and login
4/ Varify that data-categorycode is present in the loggedinuser span in
the 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>