'User must login with PIN' option not working

[chrowe]

Expected behavior
When the 'User must login with PIN' option is checked on admin/config/openscholar/pinserver users should not be able to log in to Drupal directly on the standard Drupal user login page or block. Instead they should only see the PIN login option.

Reproduce issue

1. Install and configure pinserver module
2. Check the User must login with PIN' option on admin/config/openscholar/pinserver
3. Log out and go to /user
4. You will see the username and password login form and can log in with it.