Bug 19613: Scrub borrowers fields: borrowernotes opacnote

Bug 19613: Scrub borrowers fields: borrowernotes opacnote

To prevent XSS

Signed-off-by: David Cook <dcook@prosentient.com.au>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 83db8696ca7a83aba224a0ab645f03447a96887b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 383984a0164adabc79e91ad11e2e930f5e070ed9)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Wainui Witika-Park <wainuiwitikapark@catalyst.net.nz>