Bug 23463: Fix XSLT.t

Bug 23463: Fix XSLT.t

From commit bf49eecdd87e2b29760226281ab1afc0a185c7f0
     Bug 23463: Replace AddItem calls with Koha::Item->store

in build_sample_item:
-    my $itype = delete $args->{itype}
-      || $self->build_object( { class => 'Koha::ItemTypes' } )->itemtype;
+    # If itype is not passed it will be picked from the biblio (see Koha::Item->store)

So before we generated a new itemtype if not passed, now we pick the one from biblioitem->itemtype.

For this specific test we need to make sure they are different.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>