applications/luci-splash: Always insert the mangling rules, not just when bandwidth limit is used. That makes it possible to have client bandwidth stats without using the bandwidth limit. Taken from https://github.com/freifunk/ff-control/blob/master/patches/luci-splash-mark.patch, thx Patrick

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9841 ab181a69-ba2e-0410-a84d-ff88ab4c47bc