Move hidden field outside form-group for better display of captcha field in...

Move hidden field outside form-group for better display of captcha field in bootstrap theme (#LEMONLDAP-670)

git-svn-id: svn://svn.forge.objectweb.org/svnroot/lemonldap/branches/lemonldap-ng_version_1_4-bugfixes@3403 1dbb9719-a921-0410-b57f-c3a383c2c641