Fix bug in VideoView::SetMuted()
Fix bug in VideoView::SetMuted()

 - Remove code duplication

Change-Id: I4e2d0d32d10c286195537e8a82f53f8e67d19720

dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor,dalihub/dali-adaptor