Remove a misleading comment about self.render() behavior.
The former comment suggested that View.render called with 'row' or 'col' would
set cw_row or cw_col, which is not (anymore ?) accurate.
Related to #3696871.
/* sortable tables */
table.listing tr .headerSortUp {
background-image: url(asc.gif);
}
table.listing tr .headerSortDown {
background-image: url(desc.gif);
}
table.listing tr .headerSortDown, table.listing tr .headerSortUp {
background-color: %(listingBorderColor)s;
background-repeat: no-repeat;
background-position: center right;
}