dchat: enabled localnet

doc/src/learn/dchat/deployment/deploy.md

@@ -22,6 +22,7 @@ earlier in Alice and Bob's settings.
 ```toml
 [network."dchat"]
 port = 50515
+localnet = true
 ```
 
 Now run `lilith`:

example/dchat/src/main.rs

@@ -147,6 +147,7 @@ fn alice() -> Result<AppSettings> {
         inbound: vec![inbound],
         external_addr: vec![ext_addr],
         seeds: vec![seed],
+        localnet: true,
         ..Default::default()
     };
 
@@ -170,6 +171,7 @@ fn bob() -> Result<AppSettings> {
         inbound: vec![],
         outbound_connections: 5,
         seeds: vec![seed],
+        localnet: true,
         ..Default::default()
     };