builder/digitalocean: Use correct type for image for Droplet creates.
builder/digitalocean: Use correct type for image for Droplet creates.

rnaveiras/packer,ricardclau/packer,mitchellh/packer,ricardclau/packer,hashicorp/packer,mitchellh/packer,rnaveiras/packer,rnaveiras/packer,hashicorp/packer,mitchellh/packer,ricardclau/packer,hashicorp/packer,rnaveiras/packer,mitchellh/packer,mitchellh/packer,rnaveiras/packer,pecigonzalo/packer,ricardclau/packer,pecigonzalo/packer,ricardclau/packer,hashicorp/packer,rnaveiras/packer,ricardclau/packer,pecigonzalo/packer,pecigonzalo/packer