Bug 23676: Use 'false' for opac suppression

Bug 23676: Use 'false' for opac suppression

To test:
 1 - Enable ES
 2 - Enable OpacSuppression
 3 - Suppress a bib in staff client
     Edit 942n to be 1
 4 - Search the opac for anything
 5 - Tail the plack logs and note a deprecation warning
 6 - Apply patch
 7 - Restart all the things
 8 - Repeat search on opac
 9 - No error/warn in logs
10 - Record is correctly suppressed

Signed-off-by: Myka Kennedy Stephens <mkstephens@lancasterseminary.edu>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>