AX_ARIA_08 triggers on <tr>

[avallee]

I have a tbody with role=rowgroup due to https://crbug.com/933366.

I am trying to avoid marking up every single element in my table with the correct roles, the browser should do this normally.

Now that I added the role to my tbody: AX_ARIA_08 triggers since the tr tag doesn't have a default role, but it doesn't make sense for it to be anything but row.