evaluate default_message_expire with FES consistency

[tomholub]

 // todo - rethink this. On FES, expiration is handled with S3 bucket policy regardless of this number
 // which is set to 180 days on buckets we manage. This number below may still be rendered somewhere
 // when composing, which should be evaluated.
 account: { default_message_expire: 180 }

check how default_message_expire affects the extension when FES is used. I suppose it's used to render a hint to the user. (and I know it's not used to decide the actual expiration)

Originally posted by @tomholub in #4013 (comment)