Fix String method for TypeRoute to return "route" instead of "nat"

chain/type.go

@@ -25,9 +25,9 @@ func (t Type) String() string {
 	case TypeFilter:
 		return "filter"
 	case TypeNat:
-		return "inet"
-	case TypeRoute:
 		return "nat"
+	case TypeRoute:
+		return "route"
 	default:
 		return fmt.Sprintf("unknown type %d", t)
 	}