applications/luci-splash: Set http_keepalive to zero. This fixes a problem where the user was not properly redirected after accepting the splash in some cases and when an uhttpd was used that supports http keepalive

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9884 ab181a69-ba2e-0410-a84d-ff88ab4c47bc