Can't delete image of an existing project

[Castavo]

What happened?

https://github.com/user-attachments/assets/87a99d5c-e663-491d-a4c3-261e200ff40f

[!IMPORTANT] When you add or modify an image, the delete button (red cross) appears.

What did you expect to happen?

I expect the delete button to be present whenever an image is present, not when I just added one

How can we reproduce it (as minimally and precisely as possible)?

1. Go to an existing project with an image
2. Edit it
3. Witness

On which environments the bug occurs?

Recette (SNCF)

On which browser the bug occurs?

Firefox

OSRD version (top right corner Account button > Informations)

80973c5