firewall: explictely mention network in default configuration, makes it less confusing

SVN-Revision: 26961

package/firewall/files/firewall.config

@@ -8,12 +8,14 @@ config defaults
 
 config zone
 	option name		lan
+	option network	'lan'
 	option input	ACCEPT 
 	option output	ACCEPT 
 	option forward	REJECT
 
 config zone
 	option name		wan
+	option network	'wan'
 	option input	REJECT
 	option output	ACCEPT 
 	option forward	REJECT