Add push notification icon

app/src/google/AndroidManifest.xml

@@ -16,6 +16,10 @@
             android:name="com.google.firebase.messaging.default_notification_channel_id"
             android:value="@string/notification_channel_id" />
 
+        <meta-data
+            android:name="com.google.firebase.messaging.default_notification_icon"
+            android:resource="@drawable/ic_stat_notify" />
+
         <service android:name=".ManagerMessagingService">
             <intent-filter>
                 <action android:name="com.google.firebase.MESSAGING_EVENT" />

app/src/google/java/org/traccar/manager/ManagerMessagingService.java

@@ -32,7 +32,7 @@ public class ManagerMessagingService extends FirebaseMessagingService {
         PendingIntent pendingIntent = PendingIntent.getActivity(
                 this, 0, new Intent(this, MainActivity.class), PendingIntent.FLAG_ONE_SHOT);
         NotificationCompat.Builder builder = new NotificationCompat.Builder(this, getString(R.string.notification_channel_id))
-                .setSmallIcon(R.mipmap.ic_launcher)
+                .setSmallIcon(R.drawable.ic_stat_notify)
                 .setContentTitle(getString(R.string.app_name))
                 .setContentText(remoteMessage.getNotification().getBody())
                 .setAutoCancel(true)