reduce tray icon notifications

(cherry picked from commit a4bffe3)

Author: Geosearchef

ice-adapter/src/main/java/com/faforever/iceadapter/util/TrayIcon.java

@@ -74,8 +74,6 @@ public void mouseExited(MouseEvent mouseEvent) {
 			log.error("Tray icon could not be added", e);
 		}
 
-		showMessage("ICE Adapter started");
-
 		log.info("Created tray icon");
 	}