Charges against a Long Island nurse accused of slamming a newborn baby boy face down in a bassinet in an intensive care unit were dropped on Monday, the day her trial was due to begin. Amanda Burke was fired hours after the incident last year, but state investigators said her rough treatment of the 2-day-old was “alleged simple negligence,” not “gross negligence,” and did not amount to professional misconduct, NBC New York reports. Prosecutors said that after the ruling from state licensing officials, they could not prove the charge of endangering the welfare of a child “beyond a reasonable do…