Bug 10597: fix Search to hold button on record details page

Bug 10597: fix Search to hold button on record details page

The holds button in cat-toolbar is broken for "search to hold". It is a
split button rather than a dropdown button. Clicking the caret works
fine, but clicked the button sends you to the marc editor!

Test Plan:
1) View a patron's details page
2) Click 'search to hold'
3) Search for something
4) On the results page, click a result line's title link (
    catalogue/detail.pl )
5) Note the "Place hold" button is a split button, click the left half
    of the button, note it redirects you to the editor.
6) Apply this patch
7) Repeat steps 1-5

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>