If you are on the home page and open the edit author modal, you can
automatically update all data by clicking “Quick Match” or you can
remove a set image by clicking 🗑.
Both options will update the actual data, but not the data in the open
modal. This means that, for example, a picture is still shown in the
modal after deleting it. That's confusing.
This patch fixes the bug and makes sure the modal is updated if the data
is updated.
Add a new text field 'Photo URL' on the author edit modal, if there
is no existing image for an author.
When submitted, the image is saved from the URL provided
