List Position not sortable in Views

This is kind of a limitation of the interface we have to work with. Right now, the default view at /products has sort criteria of the "Product: List Position" and the "Node: Title". These happen to be completely ignored because the view is styled as a table, and the Title column is automatically selected as a sort column.

While we could remove the default tablesorting, when someone uses clickable sorting, they can't go back to the original sort order on the List position without hacking the URL to remove the tablesort data. People complain about this.

I think the default view needs to not tease people with sort criteria that aren't used, and an issue made in the Views queue that says that the tablesorting default value needs to be more prominently displayed.

This patch removes the Sort criteria from the default view. Hopefully that will help people realize that the sorting comes from the table style by default, and not from that part of the View. This won't affect any changes people have made or will make to it, because they should know how they want the view to look.