qt: Some minor cleanups
qt: Some minor cleanups

* lang/qt/src/qgpgmequickjob.h: (GpgME::Key, QDateTime, QString):
Remove superfluous forward declarations.
(QGpgMEQuickJob): Remove superfluous second template argument. It is
identical to the default.
(QGpgMEQuickJob::result): Remove. It is already defined in the base
class.

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme