Bug 29002: (follow-up) Use $patron_to_html function

Bug 29002: (follow-up) Use $patron_to_html function

This didn't exist when we first wrote this code.. it's a useful addition
now.

Test plan
1) Follow the test plans for previous patches
2) Note the proper display of patron names in the bookings list table

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Janet McGowan <janet.mcgowan@ptfs-europe.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Laurence Rault <laurence.rault@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>