Bug 28511: Road types in OPAC should prefer OPAC description if one exists

Bug 28511: Road types in OPAC should prefer OPAC description if one exists

This patch modifies the patron entry form in the OPAC so that if street
types are defined in authorized values, the OPAC description is
preferred.

To test, apply the patch and go to Administration -> Authorized values.

- Add or edit entries in the "ROADTYPE" category.
  - Some entries should have only the "Description" set, while others
    should have "Description" and "Description (OPAC)".
- In the OPAC, open the patron registration page. Check the "Stree type"
  drop down in the "Main address" section.
  - For entries which have an OPAC description, this value should show.
  - For entries without an OPAC description the default should show.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>