Journalist API: Expiration date should be consistent
Journalist API: Expiration date should be consistent

This modifies the expiration date of the authorization token
to be consistent across the source interface, journalist interface
and journalist API. This is important because the session timeout
was set to ensure that up to 500 MB can be downloaded without
expiry of the API token. For more details, see the explanation in
https://github.com/freedomofpress/securedrop/issues/2503

heartsucker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,conorsch/securedrop,heartsucker/securedrop,conorsch/securedrop,conorsch/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop