Write begin as an explicit case for action animation switch

Author: JustATin555

src/tabs/RobotMaze/components/RobotSimulation.tsx

@@ -252,7 +252,7 @@ const RobotSimulation : React.FC<MapProps> = ({
         case 'sensor':
           animationPauseUntil.current = Date.now() + 500;
           break;
-        default:
+        case 'begin':
           robot.current = Object.assign({}, {radius: robot.current.radius}, target);
       }