core: Fix duplication of close_notify_handler for gpgsm.
* src/engine-gpgsm.c [!USE_DESCRIPTOR_PASSING] (gpgsm_new): Remove last call to _gpgme_io_set_close_notify.
It is called just after the code in question for all cases.
- GnuPG-bug-id: T4456
- Fixes-commit: dd21ec997cf4b6ba18538c63c728478110ad1f60
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>