Implicate nipple_pull with nipple_tweak

BUR #14494 has been rejected.

create implication nipple_pull -> nipple_tweak

A large amount of nipull images lack the nipinch tag on them even though they qualify. Since they need to be pinched/tweaked to be pulled it makes sense to add the implication.

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 #14494 (forum #230707) has been rejected by @DanbooruBot.

In case someone thinks of remaking this - this implication should not happen as when the nipple is being pulled by an object attached to the nipple it would not be a nipple tweak.