trivial: dell: Don't output error domain twice
trivial: dell: Don't output error domain twice

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,superm1/fwupd,vathpela/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,vathpela/fwupd,fwupd/fwupd,vathpela/fwupd,superm1/fwupd