Always show coldplugged USB devices
Always show coldplugged USB devices

When adding GUsbDevice we didn't account for coldplugging devices using the
GUsbContext enumeration.

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