Knicks’ second-round pick Tyler Nickel already showing his 3-point prowess

LAS VEGAS — For obvious reasons, Tyler Nickel prefers to wear No. 5.But that uniform was taken by Knicks guard Jose Alvarado. So Nickel settled for double-nickel.“T-Nick is my nickname, but a lot of people call me T-5,” said Nickel, the No. 47 overall pick in last month’s draft. “So [No.] 5 has been me. So when [No.] 55 was available, I was like, ‘OK, I can’t get [No.] 5, so [No.] 55 is cool.’ ”If Nickel carves out an NBA career, he’ll