Setting the world scale breaks arcade physics

Create method

```
game.world.scale.set(1.05, 1.05);
game.physics.startSystem(Physics.ARCADE);
```

somewhere in constructor of class which extends Sprite

```
game.physics.enable(this, Physics.ARCADE, true);
```

Results in the following https://gfycat.com/AggressiveBasicDungbeetle
