uhttpd: fix appending https ports to cmdline

Otherwise it is started only on non-secure ports.

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38171 3c298f89-4303-0410-b956-a3cf2f4a3e73