Clear diagnostics

[abchatra]

Sometimes error persist and just don't go away.

// add code here
scene.setBackgroundColor(9)
let myImage = assets.image`myImage0`
let mySprite = sprites.create(myImage);
controller.moveSprite(mySprite, 100, 100);
let pizza = assets.image`pizza`
let pizzaSprite = sprites.create(pizza);
pizzaSprite.setPosition(randint(0, 160), randint(0, 120));