Bug 26023: Properly secure the cashup action for libraries

Bug 26023: Properly secure the cashup action for libraries

The libraries summary page for cash management is available for users
wit the 'anonymous_refund' permission to allow them to navigate to
alternate cash registers and search for the prior transaction to refund.

However, currently the cashup option appears, and is not blocked at the
server, for all user who may access the page. It should be blocked for
those users without the 'cashup' permission.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>