don't clear the mangle table in the default firewall script

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2517 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/default/etc/init.d/S45firewall

@@ -11,7 +11,7 @@ WAN=$(nvram get wan_ifname)
 LAN=$(nvram get lan_ifname)
 
 ## CLEAR TABLES
-for T in filter nat mangle; do
+for T in filter nat; do
   iptables -t $T -F
   iptables -t $T -X
 done