The Chicago Police Department can take into account only one of an applicant’s two domestic battery arrests when deciding if he’s too violent to be a cop, the 1st District Appellate Court ruled Wednesday.Edward O’Connor disclosed on his application to become a police officer that he had been arrested twice for domestic battery, once against his mother in 2003 and once against a girlfriend in 2014.As a result, a police department inspector removed his name from the list of eligible candidates in June 2015, …