Always bind resource to XMPP stream

The XMPP server may not flag the bind feature as required but we're
still required to bind resource to the stream in order to be able to
send IQ stanzas to other clients.

lib/xmpp-client.ts

@@ -295,12 +295,10 @@ function* init(
         throw new Error("No supported SASL method");
       }
     } else if (feature.name === "bind") {
-      if (feature.children.some((c) => c.name === "required")) {
       yield* bind(socket, resource);
       return 0;
     }
   }
-  }
   return 0;
 }