Remove preset env vars for encryption keys
Remove preset env vars for encryption keys

These can be configured as +ActiveRecord::Encryption.config+ keys if you want,
so you can just use your own ENV vars in a config file if you prefer not to use
credentials.

bogdanvlviv/rails,Erol/rails,MSP-Greg/rails,betesh/rails,lcreid/rails,MSP-Greg/rails,esparta/rails,Stellenticket/rails,georgeclaghorn/rails,kmcphillips/rails,bogdanvlviv/rails,Vasfed/rails,yawboakye/rails,EmmaB/rails-1,Envek/rails,georgeclaghorn/rails,kddeisz/rails,joonyou/rails,Edouard-chin/rails,Envek/rails,yahonda/rails,kmcphillips/rails,joonyou/rails,rails/rails,Edouard-chin/rails,betesh/rails,Vasfed/rails,Erol/rails,yawboakye/rails,esparta/rails,rails/rails,Vasfed/rails,Stellenticket/rails,Edouard-chin/rails,lcreid/rails,bogdanvlviv/rails,joonyou/rails,kddeisz/rails,Erol/rails,EmmaB/rails-1,yawboakye/rails,yahonda/rails,betesh/rails,bogdanvlviv/rails,Edouard-chin/rails,BlakeWilliams/rails,betesh/rails,MSP-Greg/rails,rails/rails,kddeisz/rails,MSP-Greg/rails,BlakeWilliams/rails,EmmaB/rails-1,esparta/rails,yahonda/rails,yawboakye/rails,kmcphillips/rails,kmcphillips/rails,rails/rails,BlakeWilliams/rails,BlakeWilliams/rails,Envek/rails,Erol/rails,georgeclaghorn/rails,georgeclaghorn/rails,yahonda/rails,Stellenticket/rails,joonyou/rails,esparta/rails,Stellenticket/rails,lcreid/rails,lcreid/rails,Envek/rails,Vasfed/rails,kddeisz/rails