Imply sample_watermark -> watermark

The bulk update request #12254 has been rejected.

create implication sample_watermark -> watermark

It's a kind of watermark.

This tag used to be called sample and was slapped on any random doujinshi page from pixiv, which made it useless. When it was renamed I went through it and removed a lot of posts, but I didn't go through the entire tag, so I'm afraid that approving this as it is would add a lot of mistags to watermark.

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 #12254 (forum #221122) has been rejected by @DanbooruBot.