Imply hexagon_hair_ornament -> hexagon

The bulk update request #9940 has been rejected.

create implication hexagon_hair_ornament -> hexagon

Missing implication

hexagon_hair_ornament -hakui_koyori only gives 3 results, which makes this a similar case to topic #18648 (forum #187531)

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 #9940 (forum #210848) has been rejected by @DanbooruBot.