[#2912] Wrong icon shown for Android push notification

Signed-off-by: Andrey Shovkoplyas <motor4ik@gmail.com>

android/app/src/main/AndroidManifest.xml

@@ -32,6 +32,9 @@
             android:name=".MainApplication"
             android:largeHeap="true">
       <meta-data android:name="firebase_analytics_collection_deactivated" android:value="true" />
+      <meta-data
+              android:name="com.google.firebase.messaging.default_notification_icon"
+              android:resource="@drawable/ic_stat_status_notification" />
         <activity
                 android:name=".MainActivity"
                 android:label="@string/app_name"