context: Don't default to forcing trusted only
context: Don't default to forcing trusted only

Repos have the "gpgcheck" flag which we do honor, so forcing trusted
only seems unnecessary.  I ran into this when trying to use hif-cmd
with gpgcheck=0 repos.  Rather than expose an --untrusted flag or
something, let's just honor the gpgcheck.

The main consumer in PackageKit already handles this flag itself
depending on client request.

hughsie/libhif,juhp/libhif,hughsie/libhif,edynox/libdnf,Conan-Kudo/libhif,Conan-Kudo/libhif,kalev/libhif,kalev/libhif,hughsie/libhif,edynox/libdnf,rpm-software-management/libhif,edynox/libdnf,rpm-software-management/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libhif,cgwalters/libhif,hughsie/libhif,cgwalters/libhif,cgwalters/libhif,Conan-Kudo/libhif,Conan-Kudo/libhif,juhp/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libdnf,edynox/libdnf,cgwalters/libhif