Add done status message after backwards snowballing step

src/app.rs

@@ -243,7 +243,9 @@ impl App {
                                     }
                                 }
 
-                                self.set_status_message(StatusMessage::Info("Done".to_string()));
+                                self.set_status_message(StatusMessage::Info(
+                                    "Done".to_string(),
+                                ));
                             }
                         }
                     }