odhcp6c: fix typo in last commit

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42853 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/network/ipv6/odhcp6c/files/dhcpv6.script

@@ -155,7 +155,7 @@ case "$2" in
 		teardown_interface "$1"
 		setup_interface "$1"
 	;;
-	informed|updated|rebound|ra-updated)
+	informed|updated|rebound)
 		setup_interface "$1"
 	;;
 	ra-updated)