A common denominator in many of the fictional works about Chicago politics is that they are centered around an imaginary 51st Ward. And so it is in “Rightlynd,” the current production at Victory Gardens’ Richard Christiansen Theater through Dec. 30.However, this play by emerging African-American writer Ike Holter, written as part of a cycle of plays focused on the poor and disenfranchised residents of the fictitious 51st, could actually be located in any of the poverty-stricken, drug-infested wards, with …