fix: disable use of private PTR resolvers in DNS configuration

Author: twoone-3

src/bin/AdGuardHome.yaml

@@ -60,7 +60,7 @@ dns:
   bootstrap_prefer_ipv6: false
   upstream_timeout: 10s
   private_networks: []
-  use_private_ptr_resolvers: true
+  use_private_ptr_resolvers: false
   local_ptr_upstreams: []
   use_dns64: false
   dns64_prefixes: []