create_database: fix password comparison when creating a safe [Crash #290]

We (err, I :-)) previously removed the database_manager.set_password_check() function which was only used to be able to compare 2 passwords. I removed all of its users ... but one ... as it turns out. All credit goes to @msandova for finding this oversight.

Fixes: https://gitlab.gnome.org/World/PasswordSafe/-/issues/290