Bug 35010: In record checkout history do not show anonymous patron link

Bug 35010: In record checkout history do not show anonymous patron link

In a biblio record checkout history, when a checkout is anonymized the
patron id has been replaced by anonymous patron id.
In this case we should not show anonymous patron link.
It looks like a real patron did this checkout.

Test plan :
1) Set an existing patron id in system preference 'AnonymousPatron'
2) Perform anonymisation on old checkouts (or edit database manually)
3) Look at a record checkout history with old checkouts
=> You see 'Anonymized' for anonymized checkouts
4) Set system preference 'AnonymousPatron' empty
5) Look at same record checkout history
=> Check no error

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>