Genelia D'Souza, whose first brush with the small screen came with "Big Switch" in 2009, is set for her TV comeback. She will play a mentor on UTV Stars' "The Chosen One". Genelia, who tied the knot with actor Riteish Deshmukh in February, is already back in action. Last seen on the big screen in "Tere Naal Love Ho Gaya" with her husband, Genelia is said to be an integral part of "The Chosen One". She will play mentor to youngsters on the show, …