Bug 14582 - OPAC detail shows an unuseful link to "add tag" when user is not logged in

 Bug 14582 - OPAC detail shows an unuseful link to "add tag" when user is not logged in

This patch rearranges some parts of the OPAC detail page template so
that the "add tag" link does not appear if the user is not logged in.

This patch also includes some whitespace changes, so please diff
accordingly.

To test, apply the patch and set "TagsEnabled" to "Allow."

- With "TagsInputOnDetail" set to "Allow," view the detail page for a
  bibliographic record in the OPAC when /not/ logged in. You should see
  a "Log in to add tags" link which triggers the login modal when
  clicked.

- Log in and view the same page. Confirm that there is now an "Add
  tag(s)" link which triggers the add tags form. Confirm that the
  behavior of the add tags form is still correct.

- With "TagsInputOnDetail" set to "Don't allow" view the detail page
  again and verify that the "Log in to add tags" link doesn't appear
  when not logged in, and the "Add tags" link doesn't appear when logged
  in.

Followed test plan, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>