Bumps config test vars to app-code version 0.3.12
Bumps config test vars to app-code version 0.3.12

This wasn't present in the original 0.3.12 commit, because the config
tests don't exist in master yet.

ehartsuyker/securedrop,ageis/securedrop,ageis/securedrop,heartsucker/securedrop,conorsch/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ageis/securedrop,micahflee/securedrop,ehartsuyker/securedrop,micahflee/securedrop,garrettr/securedrop,conorsch/securedrop,garrettr/securedrop,ageis/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,micahflee/securedrop,heartsucker/securedrop,heartsucker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,garrettr/securedrop,micahflee/securedrop,conorsch/securedrop,heartsucker/securedrop,conorsch/securedrop