android [nfc]: Remove some unneeded auto-generated imports

Odd that the auto-conversion to Kotlin added these; they aren't
needed:
  #5695 (comment)

Author: chrisbobbe

android/app/src/main/java/com/zulipmobile/notifications/FcmListenerService.kt

@@ -1,11 +1,9 @@
 package com.zulipmobile.notifications
 
-import com.zulipmobile.notifications.onReceived
 import com.google.firebase.messaging.FirebaseMessagingService
 import com.google.firebase.messaging.RemoteMessage
 import com.facebook.react.bridge.ReactContext
 import com.facebook.react.ReactApplication
-import com.zulipmobile.notifications.NotificationsModule
 
 class FcmListenerService : FirebaseMessagingService() {
     override fun onMessageReceived(message: RemoteMessage) {