gpgconf: Fix symbol export.

* gpgme.def: Fix last change.
(gpgme_op_conf_save): Replace duplicate from c&p ...
(gpgme_op_conf_dir): ... with this.

• Signed-off-by: Marcus Brinkmann <mb@g10code.com>
• Fixes-commit: 9cd2b58dfb2c21cce64520cf4c726859b583d14e