A stone-faced Kim Zolciak and Kroy Biermann steered clear of each other while appearing in court to support their 15-year-old son, KJ Biermann, who is seeking bond in his sexual assault case. The “Real Housewives of Atlanta” alum wore a sleek black dress and heels as she entered Fulton County Superior Court in Atlanta for the hearing Friday. Meanwhile, the former Atlanta Falcons linebacker sported a gray top and jeans. Zolciak, 48, and Kroy, 40, arrived separately and didn’t interact once inside the courtroom. An eyewitness told Page Six that the former football player looked “stressed” in the second row of the public gallery. Zolciak,…