Bug 16968 - Remove the use of "onclick" from serial patron and vendor search templates

Bug 16968 - Remove the use of "onclick" from serial patron and vendor search templates

This patch removes instances of "onclick" from the serials templates for
patron and vendor search.

To test, go to Serials and click "New subscription."

- In the new subscription form, click the "Search for a vendor" link.
- In the popup, search for a vendor. Confirm that clicking "Choose"
  selects the correct vendor.

- From the detail page of an existing subscription, click "Create
  routing list."
- Search for a patron and test that the "Add" button in search results
  works correctly to add patrons to the routing list.

Signed-off-by: Claire Gravely <c.gravely@arts.ac.uk>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>