[orca-list] repetition of some table cell reads under Orca master and Firefox 72.0.1

[Nolan Darilek <nolan thewordnerd info>]

1. Visit https://news.ycombinator.com.

2. Arrow to the layout table containing stories.

3. Arrow down through the list.


Right now I hear things like "1. 1. 1. Upvote link: <story title here>. 
2. 2. 2. Upvote link: ..."


Thanks.