TEHRAN — Iran’s military declared the Strait of Hormuz closed again on Saturday, its military command said, hours after reopening it and with more than a dozen commercial ships passing through the vital waterway. The decision cast doubt on US President Donald Trump’s optimism the day before that a peace deal to end the US-Israeli war with Iran was “very close.”Tehran had on Friday declared the strait, which usually carries a fifth of the world’s oil and liquefied natural gas, open on Friday after a ceasefire was agreed in Lebanon to halt Israel’s war with Hezbollah. That prompted elation in…