Comment author can't edit their comment(s) if they aren't the post author

[henry.wright]

In map_meta_cap(), the edit_comment meta capability is eventually mapped to edit_others_posts which results in comment authors not being able to edit their own comment(s) if their comment(s) are on a different user's post.

Note 1: The issue is specific to the author role. The editor role doesn't see the issue because this role has the edit_others_posts cap.

Note 2: The problem doesn't exist if the comment author is also the post author. This is because, in such cases, edit_comment is mapped to either edit_published_posts or edit_posts

[meloniq]

Related #47024

[lipathor]

I think i resolved issue. Please for review.

[lipathor]

There where an error in first patch, use second one please.