TULSA, Okla. — Justin Thomas wrapped his arms around the 27-pound Wanamaker Trophy after winning his second PGA Championship, and thousands of fans ringing the 18th green amid the setting sun at Southern Hills showered him in adulation. Good thing they woke up in time for his Sunday charge. For nearly four full days, the year’s second major had been a major snooze, the cast atop the leaderboard a list mostly made up of also-rans searching for a moment stardom.