Bug 34835: Highlight logged-in library in patron searches fix for new staff interface

Bug 34835: Highlight logged-in library in patron searches fix for new staff interface

Since Bug 30952 the feature from Bug 10902 does not work anymore.
The class "currentlibrary" is there but no background color in CSS.
Bug 30952 removed it :
-    background-color: #E6FCB7;

This patch restores this rule plus '!important' that is used by
class 'ac-currentlibrary'

Test plan:
1) Perform a patrons search
2) Check you see green background color for patrons with same branch as
   currently logged in.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>