Bug 6947 : opac-topissues.pl wasn't respecting item live itemtypes

Bug 6947 : opac-topissues.pl wasn't respecting item live itemtypes

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
The search was only looking for bib level itypes independent
from the settings for item-level_itypes.

After patch the system preference setting is respected
and search works accordingly.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit 251d873b82bce4b869d2a6351b832e49e957d2c2)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>
(cherry picked from commit cdadb0993689403a7449e0c03b6d9dd590c6fded)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>