gpgconf: Silence warnings from parsing the options files

* tools/gpgconf-comp.c (retrieve_options_from_program): Set verbose
flag for the arg parser only in --verbose mode.

(cherry picked from commit ad1254b59d41e127879fc9f495d392316135b4a5)

• Signed-off-by: Werner Koch <wk@gnupg.org>
• GnuPG-bug-id: T5874