NEW YORK — Settlement talks are continuing between New York and New Jersey officials over the Garden State’s lawsuit to block Manhattan congestion tolling, MTA chairman Janno Lieber said Wednesday Lieber was mum on the details, but said the agency still planned to put the congestion toll into effect in May. “One of the ground rules of settlement discussions is you can’t talk about the substance, so I’m not going to,” Lieber told reporters. Two closed-door discussions have been held with New Jersey representatives since November — and Lieber said an additional conference was scheduled for the f…