Bug 22442: (bug 13618 follow-up) Fix item search CSV export

We must not filter assignements statements.

Test plan:
Export item search result as CSV
Without this patch the biblio and biblioitem values are not displayed.
With this patch applied everything is displayed correctly

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/includes/catalogue/itemsearch_item.csv.inc

@@ -1,5 +1,5 @@
 [%- USE Branches -%]
 [%- USE Koha -%]
-[%- biblio = item.biblio | html -%]
-[%- biblioitem = item.biblioitem | html -%]
+[%- SET biblio = item.biblio -%]
+[%- SET biblioitem = item.biblioitem -%]
 "[% biblio.title | html %] [% IF ( Koha.Preference( 'marcflavour' ) == 'UNIMARC' && biblio.author ) %]by [% END %][% biblio.author | html %]", "[% (biblioitem.publicationyear || biblio.copyrightdate) | html %]", "[% biblioitem.publishercode | html %]", "[% biblioitem.collectiontitle | html %]", "[% item.barcode | html %]", "[% item.itemcallnumber | html %]", "[% Branches.GetName(item.homebranch) | html %]", "[% Branches.GetName(item.holdingbranch) | html %]", "[% item.location | html %]", "[% item.stocknumber | html %]", "[% item.status | html %]", "[% (item.issues || 0) | html %]"