Make table header sort of Reports accessible.

The upstream issue in the sortable library has been resolved by adding an additional accessibility add on. So it needs to be brought in.

There are two additional upstream issues related to accessibility that will come in automatically when they are resolved upstream.
https://github.com/tofsjonas/sortable/issues/65
https://github.com/tofsjonas/sortable/issues/66

This went out with release 1.0.20 →