[sensors] format dart code based on the new dart formatter (flutter#3809)

Author: Chris Yang

packages/sensors/example/lib/snake.dart

@@ -99,10 +99,10 @@ class SnakeState extends State<Snake> {
     final math.Point<int>? newDirection = currentAcceleration == null
         ? null
         : currentAcceleration.x.abs() < 1.0 && currentAcceleration.y.abs() < 1.0
-        ? null
-        : (currentAcceleration.x.abs() < currentAcceleration.y.abs())
-        ? math.Point<int>(0, currentAcceleration.y.sign.toInt())
-        : math.Point<int>(-currentAcceleration.x.sign.toInt(), 0);
+            ? null
+            : (currentAcceleration.x.abs() < currentAcceleration.y.abs())
+                ? math.Point<int>(0, currentAcceleration.y.sign.toInt())
+                : math.Point<int>(-currentAcceleration.x.sign.toInt(), 0);
     state.step(newDirection);
   }
 }