NEW YORK — Confusion erupted Friday over whether the city’s youngest children should wear face masks in school, as Mayor Adams vowed to keep a mandate in place for the toddlers despite a court ruling that struck down the requirement as unenforceable. Last week, Adams vowed to lift the mask rule for kids under 5 this coming Monday as long as infection rates remained low. But in a briefing at City Hall on Friday afternoon, Adams said he would not follow through with dropping the toddler mandate after all in light of an uptick in COVID-19 infections in the five boroughs driven by the highly conta…