Print Spotify connection message only once

To avoid the terminal output getting garbled when ncspot is reconnecting

src/main.rs

@@ -168,6 +168,7 @@ async fn main() {
 
     let event_manager = EventManager::new(cursive.cb_sink().clone());
 
+    println!("Connecting to Spotify..");
     let spotify = spotify::Spotify::new(event_manager.clone(), credentials, cfg.clone());
 
     let queue = Arc::new(queue::Queue::new(spotify.clone(), cfg.clone()));