Error when trying to change the name of an image

[Julian Nicolas Herrero]

Description

When updating an image's name, the attachment should not be checked.

Steps to reproduce in https://demo.consuldemocracy.org

1. Set the max size for images to 10Mb in the admin section.
2. Create any process that allows you to attach an image, for instance, a new Proposal, with an attached image of 10Mb size.
3. Set the max size for images to 1Mb in the admin section.
4. Try to edit the name of the image attached in the edit a Proposal form.

You will get the following error message:

1 error prevented this Proposal from being saved. 
Please check the marked fields to know how to correct them:

But no field will be marked in red color.

[Senén Rodero]

Solved by:

• #5168