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Simplify secret key export

Description

Simplify secret key export

* Do not ask for "ASCII Armor" as users do not know what this means.
* Do not ask for passphrase-charset for S/MIME we use utf-8.
* Just use a file dialog with a default name.

This should make the secret key export a bit smoother. Especially
right after the keygen when we ask to save the key for a backup
we do not want to offer confusing options afterward.

Details