Bug 31410: Set focus for cursor to Server name when adding a new Z39.50/SRU server

Bug 31410: Set focus for cursor to Server name when adding a new Z39.50/SRU server

This makes sure that the focus is in the first form field when
adding a new Z39.50 or SRU server.

To test:
* Administration > Z39.50/SRU servers
* Add a new server for each
* Verify the focus is not in the form
* Apply patch
* Verify the focus is now in the first form field
* Edit an existing server
* Verify the focus is not in the form

Not having the focus when editing is to avoid accidental changes.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>