Bug 29055: Focus on keyword field when subscription biblio search window opens

Bug 29055: Focus on keyword field when subscription biblio search window opens

This patch adds the "autofocus" attribute to the keyword field in the
popup window used to find a bibliographic record to use in a
subscription.

The same is also done for the vendor search popup.

To test, apply the patch and go to Serials -> New subscription.

- Click the "Search for vendor" link. When the "Serial subscription:
  search for vendor" window opens the cursor should automatically be in
  the vendor search field.
- Click the "Search for record" link. When the "Catalog search" window
  opens the cursor focus should automatically be in the keyword field.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>