MINNEAPOLIS — Joel Embiid corrected a media member who stated at Friday’s shootaround that James Harden taught him the step-back jumper. “I was already doing that step back since last year,” Embiid said. “So I already had that, but I just wanted to use it since he got here. So I wanted to use it even more.” Harden will make his Sixers debut Friday night against the Minnesota Timberwolves after being acquired via a trade from the Brooklyn Nets on Feb. 10. Harden’s signature move is his step-back 3-pointer. Some have tried to duplicate Harden’s move, only to be called for traveling. Harden manag…