Without any major new releases on Friday, “ Michael ” moonwalked right to the top of the box office charts. Lionsgate’s “Michael” earned $7 million domestic on Friday and is expected to add an impressive $25 million to $28 million by Sunday. That represents about a 27% drop from last weekend’s earnings. The biopic about the life and times of the King of Pop has exhibited excellent staying power since its record-setting $97 million debut. By the end of its fourth weekend, it’s expected to