luci-app-cjdns: remove orphaned HTML closing tags

No corresponding <span> or <div> tags, so remove the closing tags left
in settings.lua. Also replace <br> by <br/>, so we end up with an
XML compliant document.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Merge pull request #33 from dangowrt/master

luci-app-cjdns: remove orphaned HTML closing tags