In 2015, the USA cable network was a force in original programming. Dramas like “Suits,” “Mr. Robot” and “Royal Pains” either won awards or attracted big audiences. What a difference a few years make. Viewership is way down, and USA’s original programming department is gone. The channel has had just one original scripted show this year, and it is not exclusive to the network — it also airs on another channel. During one 46-hour stretch last week, USA showed repeats of NBC’s “Law & Order: Special