Bug 20968: (follow-up) Respond to feedback

Bug 20968: (follow-up) Respond to feedback

This patch:

- Removes the unecessary testing for
intranet_catalog_biblio_enhancements method in detail.pl
- Renames get_toolbar_button to get_intranet_catalog_toolbar_button

Signed-off-by: Stephen Graham <s.graham4@herts.ac.uk>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 7910a530b85b6ee42307d41cba57b95ced2aca27)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>