Space image updated with `edit` permission

[jesmrec]

Describe the bug

A space member with editor permission is not allowed to edit image

If a manager (allowed to edit image) is downgraded to editor by another manager while a new image is being chosen, the operation is allowed.

Is editor allowed or not?

Steps to reproduce

Performed with a mobile client:

1. User1 is manager of the space
2. User1 choose Edit image
3. Before choosing an image, another space manager downgrades User1 to editor
4. User1 submit the image

Expected behavior

Either the option is displayed and listed also for editor , or the operation is not allowed for editor

Actual behavior

Option not displayed for editor but allowed under the hood.

Setup

ownCloud Infinite Scale
Edition Community
Version 7.3.0
Web client version 12.1.1