Remove unnecessary autoload call from PasswordStrategies module.

Hello, thoughbot! 

I think this is a leftover from 6dbfc12a417165b6ad0270df7b863d0b540a313a, since the `Clearance::PasswordStrategies::Fake` module doesn't exist anymore. Considering this is a bosonic diff, I didn't add any tests but I ran the suite after this change and all tests passed.