Bug 21706: (QA follow-up) Fix tabs

Bug 21706: (QA follow-up) Fix tabs

Not all href's should have parameters URI encoded. Because sometimes
they are just where for use by JavaScript libraries which fail in that
situations. For fixed-lenght fields we use @ as the subfield code and it
breaks the bootstrap tabs if we URI encode the '@'.

This fixes the tabs issues on fixed-lenght fields in the authority type
editing pages.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>