Bug 33253: Turn off autocompletion for 2FA authentication code

Bug 33253: Turn off autocompletion for 2FA authentication code

The form for entering your authentication code shoudl not suggest
previous codes.

To test:
* Activate TwoFactorAuthentication
* Go to your patron account in staff
* More > Manage 2-factor authentication
* I used "Google authenticator" on my phone, so:
* Open app on your phone, add new and scan the QR code
* Enter activation code
* Log out of staff interface
* Log back in, you are now also asked for an authentication code
  as second step
* Look up code in app, enter, get logged in
* Log out, log back in - the form now suggests the previous code
  when you click on it
* Apply patch
* Reload things (restart_all on ktd)
* Verify that you no longer get the suggestion

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>