fix(network): restore ExternalIP in server info response (#5043)

Author: neatnoise

src/nvhttp.cpp

@@ -761,6 +761,10 @@ namespace nvhttp {
     }
     tree.put("root.ServerCodecModeSupport", codec_mode_flags);
 
+    if (!config::nvhttp.external_ip.empty()) {
+      tree.put("root.ExternalIP", config::nvhttp.external_ip);
+    }
+
     auto current_appid = proc::proc.running();
     tree.put("root.PairStatus", pair_status);
     tree.put("root.currentgame", current_appid);