Don't set password values in the UI in the installation wizard

When you run the initialization wizard, the password fields have their fields preset if the wizard has been run and a user has entered values in the fields before. That should not happen. When you run the installation wizard, it should have empty password values, and require you to enter a (new) password.

See databasetablesamduser.vm, simplesetup.vm and databasesetup.vm