Bug 17993 - Do not use modal authentication with CAS - tags

Bug 17993 - Do not use modal authentication with CAS - tags

Bug 12046 corrected the fact that modal dialog does not allow to use the CAS authentication in main authentication link.
This must also be corrected in link for tags in detail page : "Log in to add tags"

Test plan :
- Enable syspref casAuthentication
- Go to OPAC
- Go to a record detail page opac-detail.pl
- Click on "Log in to add tags"
=> Without patch you get the modal login popup
=> With patch you go to the login page opac-user.pl

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Mason James <mtj@kohaaloha.com>