columnviewcell: Remove "visible" property setting

Since 7ad693f865 we only create cells for
visible rows and don't just toggle visibility.

This is a leftover from that change.

gtk/gtkcolumnviewcell.c

@@ -236,7 +236,6 @@ gtk_column_view_cell_new (GtkColumnViewColumn *column)
 
   cell = g_object_new (GTK_TYPE_COLUMN_VIEW_CELL,
                        "factory", gtk_column_view_column_get_factory (column),
-                       "visible", gtk_column_view_column_get_visible (column),
                        NULL);
 
   cell->column = g_object_ref (column);