Bug 27195: Set focus on first input when adding a new city

Bug 27195: Set focus on first input when adding a new city

When adding a new city, the focus/cursor should be
in the first input field of the form: City

To test:
* Add a new city in administration > cities
  - cursur is in no field
* Apply patch
* Add another new city
  - cursor is now in the first input field of the form: City

https://bugs.koha-community.org/show_bug.cgi?id=27193

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>