Bug 11226: subscription frequencies and numbering patterns should be editable with serials permissions

 Bug 7688 does now allow patrons with serials permissions to edit
 subscription frequencies/numbering patterns.

 Test plan:
 Try to access to serials/subscription-frequencies.pl and
 serials/subscription-numberpatterns.pl with the "serials" permissions.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
With patch and only serial permissions can now access
frequences and patterns.
No koha-qa errors

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit dac26290b0feb08277a7d4bb7929559dfe7b36c4)