(Screen capture by The Desk) DIRECTV’s pay television customers are waking up this weekend with one more news channel in their package. The service quietly added C-SPAN 3 to its satellite and streaming lineups, making the full C-SPAN linear multiplex available through its connected TV apps for the first time. C-SPAN is a commercial-free, non-profit public service broadcaster that covers political affairs from Washington, D.C. and other parts of …