webapi: Move "listening" log to server start.

Moving this log closer to where the server is actually started reduces
the chance of confusion. Also, logging the parsed listener.Addr() string
instead of the provided config string provides extra debugging detail.

internal/webapi/webapi.go

@@ -120,7 +120,6 @@ func New(vdb *database.VspDatabase, log slog.Logger, dcrd rpc.DcrdConnect,
 	if err != nil {
 		return nil, err
 	}
-	log.Infof("Listening on %s", cfg.Listen)
 
 	w := &WebAPI{
 		cfg:         cfg,
@@ -163,6 +162,7 @@ func (w *WebAPI) Run(ctx context.Context) {
 	// Start webserver.
 	wg.Add(1)
 	go func() {
+		w.log.Infof("Listening on %s", w.listener.Addr())
 		err := w.server.Serve(w.listener)
 		// ErrServerClosed is expected from a graceful server shutdown, it can
 		// be ignored. Anything else should be logged.