Bug 31405: Set focus for cursor to setSpec input when adding a new OAI set

Bug 31405: Set focus for cursor to setSpec input when adding a new OAI set

Makes sure the focus is in the first form field when adding
a new OAI set: setSpec

To test:
* Go to administration > OAI sets
* Add a new set, verify the focus is still in the search bar on top
* Apply patch
* Repeat and verify the focus is now in the first form field
* Save set
* Edit set and verify the focus is in the search field at the top

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