cutter: fix and remove BROKEN flag

Cutter was marked as broken a long time ago, cutter is utility used for disconnecting ongoing TCP connections.
Problem was that it didn't support nf_conntrack.

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@39978 3c298f89-4303-0410-b956-a3cf2f4a3e73