Bug 9292 - Remove dead code related to 'publictype'

Bug 9292 - Remove dead code related to 'publictype'

This patch removes the superflous code related to 'publictype' which
is a key set for item hashes in some perl files. This key is never
used or stored.

Test Plan:
1) Apply patch
2) Test catalogue/detail.pl, opac/opac-detail.pl and opac/opac-user.pl
3) You should not see any changes in behavior

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>