A week after President Donald Trump’s bold talk about U.S. oil majors “going in and spending billions” to revive Venezuela’s wrecked crude industry, the administration is now walking back the idea of direct U.S. cash backing for that effort, even as it convenes a who’s-who of energy executives at the White House. Earlier in the week, Trump publicly portrayed Venezuela’s reopening to Western oil investment as a near-done deal, framing multi-billion-dollar capital commitments by firms like Chevron, ExxonMobil and…