Thumbnails are not displayed for elements with images less than 400 pixels high

This image is very smol: https://preprod-arkindex-iiif.europe.iiif.teklia.com/iiif/2/d05ad2f4-9aae-48a8-96a9-04ccad8a7924/full/full/0/default.jpg

It works "fine" in the InteractiveImage:

It works on the image elements list as well.

It works in the preview dropdown in element lists:

But it cannot be displayed as a thumbnail in element lists, because the frontend is requesting for a resize to 400 pixels in height, which goes way beyond the 11×16px of the smol image.

Cantaloupe complains for images this smol, but it does not complain about resizing a very smol crop of a lorge image. So this affects elements with images less than 400 pixels high, not polygons.

We need to avoid generating IIIF URLs that resize beyond the size of the original image.