A federal judge has declined to throw out a $4.75 million verdict awarded to three siblings injured when a Chicago police officer fired 11 shots into their back porch during a New Year’s Eve party.Kierra, Princeton and Michael Williamson sued Chicago police officer Wilfredo Ortiz and the city alleging excessive force and 14th Amendment violations after Ortiz shot them at a New Year’s house party after midnight on Jan. 1, 2014.Ortiz was on duty at the time of the incident and arrived at the house after a …