[CB-1605] Warning cleanup! Removed unused import.

Author: mwoghiren

src/android/Notification.java

@@ -27,7 +27,6 @@ Licensed to the Apache Software Foundation (ASF) under one
 import org.json.JSONObject;
 import android.app.AlertDialog;
 import android.app.ProgressDialog;
-import android.content.Context;
 import android.content.DialogInterface;
 import android.media.Ringtone;
 import android.media.RingtoneManager;