StudentFeedbackQuestionSubmitPageUiTest fails on the staging server

[Fixes #72843056]
Professor @damithc When I tried to use verifyHtmlMainContent, I found that in FeedbackQuestionSubmissionEdit.jsp there is an extra </div> which cause the above method to fail. However, this typo also cause all related feedback submit pages to fail after removing the </div>. Should I fix all the pages related to this?