Add support for configurable image styles in Section Library thumbnails

Patch to 1.1.*

rolki → closed merge request !34

The module uses the default image if the user has not uploaded one for the section:

// Default library image.
$img_path = $this->extensionListModule->getPath('section_library') . '/images/default.png';

If you don't upload an image for a section (this field is optional) then the image in the form of adding a section from the library looks broken:

Image style cannot be applied to an image that has not been added as an EntityFile to the site database and file system:

I think that the default image should not have an Image Style. It is necessary to leave the original from the module.

Heads up that I've been approaching this problem in a more wholistic way by making the image field a true image field and template entities fieldable here: https://www.drupal.org/project/section_library/issues/3442106 ✨ Make section library template entities fieldable Needs review

@jastraat
That's great, I didn't notice your issue, thanks for pointing it out, I'll try what you did 💪🏽

Thanks! I'd love more testers :)