Bug 16403: Remove unnecessary undef param

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

t/db_dependent/Holds.t

@@ -73,7 +73,7 @@ foreach my $borrowernumber ( @borrowernumbers ) {
         $borrowernumber,
         $biblionumber,
         my $bibitems = q{},
-        my $priority = C4::Reserves::CalculatePriority( $biblionumber, undef ),
+        my $priority = C4::Reserves::CalculatePriority( $biblionumber ),
         my $resdate,
         my $expdate,
         my $notes = q{},