Epub validation error cuased by aria-describedby attribute

Expected behaviour

When "Long description" attribute isn't used in cofig, the attribute should be included

Current behaviour

In the Ketty app we get an epub validation error: The aria-describedby attribute must refer to elements in the same document (target ID missing) this attribute isn't enabled for users to add.

Steps to reproduce

1. Add image in chapter
2. Try export to epub
3. Get error
4. Got back to image image and inspect

<img src="https://kotahi-s3.cloud68.co/test2-ketida/703ba07ac798_medium.jpeg?X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=gbrqLPQZVrxwcsBaRztVkJTdLNqVOo%2F20240729%2Fus-east-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20240729T145537Z&amp;X-Amz-Expires=86400&amp;X-Amz-Signature=90f15f9ff0bbf750f14aa4b0461f0ad3d2e63ef34d547b521589cd28d0193564&amp;X-Amz-SignedHeaders=host" alt="This is alt text" aria-describedby="1562dbee-7553-4df6-aa56-7975b5968141" aria-description="" data-id="abdde0c3-f315-448f-a9c4-107b9896d87b" data-fileid="0567f6bf-02cd-4ed2-8b8b-7631be460e1b" contenteditable="false" class="">

Environment

Possible solution

The fix in wax should avoid adding aria-description if we haven't specified that we want to use image descriptions in the config