Update ScheduleProvider.java

Fix issue google#91 deleteDatabase not working under Lollipop

Author: MaTriXy

android/src/main/java/com/google/samples/apps/iosched/provider/ScheduleProvider.java

@@ -544,7 +544,7 @@ public int update(Uri uri, ContentValues values, String selection, String[] sele
     public int delete(Uri uri, String selection, String[] selectionArgs) {
         String accountName = getCurrentAccountName(uri, false);
         LOGV(TAG, "delete(uri=" + uri + ", account=" + accountName + ")");
-        if (uri == ScheduleContract.BASE_CONTENT_URI) {
+        if (uri.equals(ScheduleContract.BASE_CONTENT_URI)) {
             // Handle whole database deletes (e.g. when signing out)
             deleteDatabase();
             notifyChange(uri);