title: how to remove firebase.notifications().onNotificationOpened listener?
body: <p>I am working on a react native project and using react-native-firebase library. Setting up listener is working but I am not able to find a way to remove listener.</p>
  
  <p>I am setting up this listener on homepage so whenever user reach to homepage. Listener get registered multiple times and action multiple times as result.</p>
  
  <p>I want to destroy this listener then again start a new one.</p>
  
  <pre><code>firebase.notifications().onNotificationOpened((notificationOpen) =&gt; {
          if (notificationOpen) {
            const notification: Notification = notificationOpen.notification;
            if(notification.data.type){
            }
          }
        });
  </code></pre>
  
  <p>If anyone can help, that will be appreciated...</p>