Shaunae Miller-Uibo ran away with the 400-meter title at world championships. Now, she may be walking away from the one-lap event for good. From now on, the sprinter from the Bahamas will dabble more in the 200-meter realm. Although she’s hinted at that particular plan before, this time it seems more permanent. She’s already a two-time Olympic gold medalist in the 400 and just captured a world title Friday—the one crown missing from her resume. “I’m putting it to rest. I’ve accomplished it all in the event,” said Miller-Uibo, who finished in 49.11 seconds to beat Marileidy Paulino of the Domin…