TED Turner certainly didn’t get treated like the owner when he arrived for dinner Wednesday night at Ted’s Montana Grill on West 51st Street. “The staff didn’t recognize him,” said one witness. “Instead of a booth, they put him at a stand-alone table near the kitchen.” Then, when a couple joined him, they had a long wait for a menu. But he didn’t raise a peep. Turner, who pledged $1 billion to the UN in the days when CNN was the king of cable, has mellowed since the time when he was known as “Captain Outrageous” and the “Mouth of the South.”