Bug 20144: [sql_modes] Add default value for subscription_numberpatterns.description in tests

Fix for:
Field 'description' doesn't have a default value

t/db_dependent/Serials.t

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>

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

t/db_dependent/Serials.t

@@ -67,6 +67,7 @@ my $budget_id = AddBudget({
 my $frequency_id = AddSubscriptionFrequency({ description => "Test frequency 1" });
 my $pattern_id = AddSubscriptionNumberpattern({
     label => 'Test numberpattern 1',
+    description => 'Description for numberpattern 1',
     numberingmethod => '{X}',
     label1 => q{},
     add1 => 1,