Replace BrowserID image (see http://mail.ow2.org/wws/arc/lemonldap-ng-dev/2013-10/msg00048.html)

git-svn-id: svn://svn.forge.objectweb.org/svnroot/lemonldap/trunk@3021 1dbb9719-a921-0410-b57f-c3a383c2c641