After a 10-year break, Steve Carell returned for his third stint as host of Saturday Night Live last night. The episode, featuring musical guest Ella Mai and a mini Office reunion, averaged a 4.4 Live+same day household rating in the metered markets and a 1.7 adults 18-49 rating in the markets with local people meters. That was up from the season lows logged by last week’s show, hosted by Liev Schreiber with musical guest Lil Wayne (4.0, 1.5) and on par with the episode…