“Taking the season one game at a time” might be the biggest cliche in sports, but it’s actually appropriate for the Mets right now. Every game matters right now with the Mets trying to climb the standings before the trade deadline next Tuesday. A veteran clubhouse doesn’t necessarily need to remind everyone to focus on the task ahead instead of letting their mind drift toward deadline news and rumors, but that isn’t always as easy it sounds. “It’s hard to not wonder,” outfielder Brandon Nimmo said Wednesday before the Subway Series finale at Yankee Stadium.