Donald Trump’s a native New Yorker yet somehow when he posted a nod to the city’s esteemed FDNY agency for welcoming him at a firehouse to deliver some pizza pies — he did so using the acronym “NYFD.” And when it clearly was discovered to be a mistake for the 45th president and real estate mogul who called decades the Big Apple home for several decades and apparently “built the skyline of New York” — the Truth Social post was deleted with news ones properly using the FDNY in its place. Trump made the trip to Engine 8 Ladder 2 firehouse in Midtown Manhattan soon after he concluded another day i…