kohabug 2150 Correcting (somewhat) the inconsistent use of autoBarcode syspref

kohabug 2150 Correcting (somewhat) the inconsistent use of autoBarcode syspref

This patch corrects somewhat the inconsistent use of the autoBarcode syspref in serials-edit.pl
It does not impliment all the possibilities currently available in the autoBarcode syspref as
there is currently no support for the js plug-in/drop-in feature in serials-edit.pl. So in this
sense, the autoBarcode syspref is still used inconsistantly here. The fix for this is recommended
for rel_3_2

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>