A federal judge declined to halt Meta Platforms Inc.’s META 2.79%increase; green up pointing triangle acquisition of the virtual-reality startup Within Unlimited, delivering a setback to antitrust enforcers at the Federal Trade Commission seeking to block the deal, a person familiar with the ruling said. In a sealed court decision issued overnight, U.S. District Judge Edward Davila in San Jose, Calif., denied the FTC’s request for an injunction blocking the proposed merger, the person said.