trivial: debian: update signing template to match downstream
trivial: debian: update signing template to match downstream

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd