Small JS clarification for finding table cell

Although it happened to be the parent element in this case, we are
really just looking for the containing cell. Change the call to closest
so we are future-proofed.

Signed-off-by: Dan McGee <dan@archlinux.org>

media/archweb.js

@@ -150,7 +150,7 @@ function todolist_flag() {
                 'incomplete').removeClass('complete');
         }
         /* let tablesorter know the cell value has changed */
-        $('.results').trigger('updateCell', $(link).parent('td'));
+        $('.results').trigger('updateCell', $(link).closest('td'));
     });
     return false;
 }