Cannot save content after resetting crop on a required image

Problem/Motivation

Resetting a crop should not make it impossible to save a piece of content.

Steps to reproduce

1. Edit a node with a previously applied crop
2. Press the "Reset crop" button
3. Try to save the node
4. You will receive an "Image is required." error and be unable to save the page (this is despite there of course being an image, and in our case, despite this being on a content type without the image being required.

Proposed resolution

• Allow disabling the reset crop button. It's not very useful? Or maybe it's a problem of #3161008: Delete reseted crop if nothing applied
• Ensure "Reset crop" actually applies a maximum size crop?

Remaining tasks

User interface changes

API changes

Data model changes