The New York Knicks (19–20) successfully made their largest comeback of 25 points, since 2004, against their 75-year rival Boston Celtics (18–21) on Thursday at Madison Square Garden, on R.J. Barrett’s desperate last-second bank-shot to win 108–105. “It was a tough shot, but every time I shoot I think it’s going in,” Barrett said. “Honestly, I didn’t even see it because I fell. I didn’t see it go in, but just by everyone else’s reaction I could tell. So that was cool.” Evan Fournier led the Knicks with  41 points, 13 in the fourth quarter. He was 15 of 25 shooting, with 10–14 three-pointers. The last seven times a player has scored 40 or more, with 10 threes, was by Stephen Curry. Fournier also had eight rebounds and two assists. “My guy [Fournier], he always goes crazy against the Celtics,” said Barrett. Fournier brought his average up to 13.5 points …