Bug 24627: Correct style of clubs search results during hold process

Bug 24627: Correct style of clubs search results during hold process

This patch updates some markup and CSS so that the process of selecting
a club from search results during the hold process looks the same as
when selecting a patron: Club names should be links (like patron
names are) and the table row should have a hover color to help indicate
that it is clickable.

This patch also changes the markup of the Patrons/Clubs tabs a little
bit to make the information clearer: Superfluous Bootstrap-related tab
markup has been removed, and the patron and club search results have
been moved into their respective tab containers. This means that if you
search for a patron but then switch to the clubs tab the patron list
doesn't still display.

To test, apply the patch and rebuild the staff client CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client)

 - You should have more than one patron club defined.
 - Begin the process of placing a hold on a title.
 - Test the process of searching for both patrons and clubs.
   - In each case the name (patron or club) should be an active link.
   - Hovering your mouse over the table rows should change the row
     background to yellow.
   - Clicking the other tab at this stage should hide the search results
     from your last search.
   - Whether you click the linked name or elsewhere in the table row
     you should be correctly redirected to the next step in the holds
     process.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>