Notes created with comments hidden persist only in the hidden state

If you hide comments on a diff and then create a new note, the new note will only ever appear when hide comments is enabled.

mentioned in merge request !5818 (merged)

Status changed to closed by merge request !5818 (merged)

mentioned in commit tnir/gitlab-ce@c063ee5e

mentioned in commit 58e25cb3

mentioned in merge request !14785