Remove two invalid config variables
Remove two invalid config variables

(I missed two instances of the nixed Heroku email/password config
variables in PR #503.)

Dallinger/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger