Revert "Read full table row when caret navigation was used"
Revert "Read full table row when caret navigation was used"

This reverts commit 314e0de4ebf618c4f6a4eeeb76cbfee861290303.

It turns out this fixes the problem on one particular (and odd) grid,
but makes other tables chatty.

GNOME/orca,GNOME/orca,GNOME/orca,GNOME/orca