imply halftone_background -> dotted_background

BUR #30443 has been rejected.

create implication halftone_background -> dotted_background

Halftone background is mainly composed of dots that vary in size, shape or spacing.

This bulk update request is pending automatic rejection in 5 days.

This bulk update request has been rejected because it was not approved within 45 days.

The bulk update request #30443 (forum #300077) has been rejected by @DanbooruBot.