Former President Donald Trump’s hush money trial is coming up soon, pending a last-ditch legal motion to postpone it that many experts believe will go nowhere — and his allies are starting to worry he’ll get himself in more trouble by running his mouth in court. The case, brought by Manhattan District Attorney Alvin Bragg, centers on Trump’s alleged hush payments to adult film star Stormy Daniels to conceal an affair between them, blocking the information from voters ahead of the 2016 election — which Bragg charges as felony business fraud, in service of an illegal campaign finance scheme to m…