A Cook County judge on Wednesday dismissed a woman’s bid to collect child support from her contracted sperm donor after she declined to contest whether her children were conceived while the two were romantically intimate.Circuit Judge James L. Kaplan dismissed petitioner Karina Dahlen’s case against respondent Dzmitry Slizhou after Dahlen said she could not afford and did not want to retain an expert to determine whether her twin girls were conceived through in vitro fertilization or during the few overlapping …