fix(zone): use correct path for zone localhost

ref: #33 #34

Author: jon-nfc

includes/etc/bind/conf.d/internal/localhost.zone.conf

@@ -1,6 +1,6 @@
 zone "localhost" IN {
 	type master;
-	file "pri/localhost.zone";
+	file "pri/internal/localhost.zone";
 	allow-update { none; };
 	notify no;
 };