Fixing the position of the paging controls in the scaffolding app.

Review at http://gwt-code-reviews.appspot.com/738802

Review by: rjrjr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8477 8db76d5a-ed1c-0410-87a9-c151d255dfc7