Bug 18647: Resolve internal server error on category_type

Bug 18647: Resolve internal server error on category_type

See bug 18552. When we resolved the housebound_role bug, the hash got
filled correctly again. And this revealed that the (second) call to
Koha::Patrons->find was not appropriate. It can be removed, as Jonathan
explained on the report.

Note: Commit 95429af6855e8ed37945b681dc466bf360deffb added this call, but
it was hidden until the template variable hash got fixed.

Test plan:
Restart Plack and go to patron details again.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>