tests/gpg: skip test in JS if GPG is not supported
tests/gpg: skip test in JS if GPG is not supported

Skip the single JS test which throws an error if GPG support
is disabled in a build time.

Signed-off-by: Denis Pynkin <3fbf95ee68899518ee8799d35f88c8f7982aa936@collabora.com>

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree