Space image updated with `edit` permission

## 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