In the formkit conversion in 2ca06ba236
we missed setting a type for the UppyImageUploader for badges. Also,
we were not passing down the `image_url` as form data, so when we used
`data.image` for that field the badge was not updating in the UI after
page loads and the image URL was not loading for preview.
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>