Fix for Bug 5281, "Check in" then "Renew" checkboxes checked in the same time

Fix for Bug 5281, "Check in" then "Renew" checkboxes checked in the same time

This fix corrects the behavior of the checkboxes whether the user clicks the
checkbox itself or the <td> around it. Tested on a PC in Firefox 3.6, Chrome,
Safari 5, and IE 8.

Signed-off-by: Chris Nighswonger <cnighswonger@foundations.edu>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit cc57c2688d73046ee4930869d2d7fabdc8dd37ca)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>