Bug 14044: Escape json strings for patron searches

Bug 14044: Escape json strings for patron searches

In a couple of patron searches, the address is displayed.
If the address contain invalid json characters, DataTables won't manage
to parse the results and display them.
This patch makes the templates more readable by creating a BLOCK instead
of a long line and escape the invalid json characters calling the TT
plugin (To.json).

Test plan:
Edit a patron and add something like:
    patron <address> \123 ☎ ⚑
in the address field.

Search for this patron using the main patron search (members/member.pl)
and the guarantor search.
Confirm that a result with this patron is correctly displayed.

Regression test: Since Koha::Template::Plugin::To::json is modified,
confirm that the add users to basket search (on acqui/basket.pl?basketno=X
click on the "Add user" button) still works as expected.

Signed-off-by: Christopher Brannon <cbrannon@cdalibary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>