MSND-63 Resize the containing iframe after we've updated the DOM.

Otherwise we update the size of the frame, then the AJAX call completes and we change the size of the page.

git-svn-id: https://source.sakaiproject.org/svn/mailsender/trunk@125703 66ffb92e-73f9-0310-93c1-f5514f145a0a