Bug 14450: itemsearch no longer working

To test:
Click Advanced search in staff client
Click the link for "Go to Item Search" at the top of the page
Do a search, you should get results. Try some combinations and make sure it works like it should.

Signed-off-by: Jacek Ablewicz <abl@biblos.pk.edu.pl>

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

catalogue/itemsearch.pl

@@ -37,7 +37,7 @@ my %params = $cgi->Vars;
 my $format = $cgi->param('format');
 my ($template_name, $content_type);
 if (defined $format and $format eq 'json') {
-    $template_name = 'catalogue/itemsearch.json.tt';
+    $template_name = 'catalogue/itemsearch_json.tt';
     $content_type = 'json';
 
     # Map DataTables parameters with 'regular' parameters
@@ -69,7 +69,7 @@ if (defined $format and $format eq 'json') {
     $cgi->param('op', @op);
     $cgi->param('c', @c);
 } elsif (defined $format and $format eq 'csv') {
-    $template_name = 'catalogue/itemsearch.csv.tt';
+    $template_name = 'catalogue/itemsearch_csv.tt';
 
     # Retrieve all results
     $cgi->param('rows', 0);