NEW YORK — The Mets dodged a bullet in the shape of a big, fat E1 on Tuesday afternoon, as what could have been a crucial fielding blunder by pitcher David Peterson ended up as nothing more than a footnote. In the Mets’ 5-4 win to start their doubleheader against the Braves, a 5-1 lead quickly became 5-4 when Matt Olson followed Peterson’s error with a three-run crack into the Braves’ bullpen. Peterson, the obvious odd man out whenever Jacob deGrom returns from his scapula injury, was solid but unspectacular yet again. His final line (five innings, four hits, four runs, six strikeouts) would h…