delete the --image-background-size variable

[szaimen]

Address nextcloud/firstrunwizard#789 (comment)

Signed-off-by: Simon L szaimen@e.mail.de

[skjnldsv]

The entire block can be removed then

- if ($image === 'background') {
- 	// If background deleted is set, ignoring variable
- 	if ($backgroundDeleted) {
- 		continue;
- 	}
- }

[juliushaertl]

The entire block can be removed then

Isn't it still relevant for the background image url below?

[skjnldsv]

No, it was only there because of the apps icons gradient being applied as well as the primary.
Now that we only have full-screen images or not at all, we don't need different background sizes

[szaimen]

The entire block can be removed then

- if ($image === 'background') {
- 	// If background deleted is set, ignoring variable
- 	if ($backgroundDeleted) {
- 		continue;
- 	}
- }

done 👍

[szaimen]

/rebase