Jay Leno took a shot this week at Bain Capital while complaining about his NBC bosses. In his first night on the air since the late-night show laid off two dozen employees and the host himself took a pay cut, Leno didn’t waste time talking about the situation. “Welcome to ‘The Tonight Show,’ or as Comcast calls us, ‘The Expendables!’ ” said Leno. “As you may have heard, our parent company has downsized ‘The Tonight Show.’ . . . We’ve been consistently No. 1 in the ratings. And, if you know anything about our network, that kind of thing is frowned upon around here.” But he wasn’t done. Leno, who grew up in Andover, then took aim at Mitt Romney ’s old management consulting firm. “More bad news. Turns out now we’ve been taken over by Bain Capital,” he said. “I knew something was going on. Friday morning I woke up and there was a peacock head in my bed.” But don’t shed too many tears for Leno. While it’s true his salary was cut by a couple million dollars, the host is still making $20 million a year.