Fix related to BigLargeIcon to be set using an Icon

Author: welishr

firebase-messaging/src/main/java/com/google/firebase/messaging/DisplayNotification.java

@@ -144,7 +144,7 @@ private void waitForAndApplyImageDownload(
        * notification does as well.
        */
       n.setLargeIcon(bitmap);
-      n.setStyle(new BigPictureStyle().bigPicture(bitmap).bigLargeIcon(null));
+      n.setStyle(new BigPictureStyle().bigPicture(bitmap).bigLargeIcon((bitmap) null));
 
     } catch (ExecutionException e) {
       // For all exceptions, fall through to show the notification without the image