move around the legacy export config
move around the legacy export config

let the ykp_write_config() call ykp_legacy_export_config(), and call
the write function in that place only.

Yubico/yubikey-personalization-dpkg,eworm-de/yubikey-personalization,dmitriykuptsov/yubikey-personalization,dmitriykuptsov/yubikey-personalization,eworm-de/yubikey-personalization,Yubico/yubikey-personalization,dmitriykuptsov/yubikey-personalization,eworm-de/yubikey-personalization,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization,Yubico/yubikey-personalization-dpkg