Remove unused r variable.

Author: hperrin

site/content/tutorial/06-bindings/11-bind-this/app-a/App.svelte

@@ -5,8 +5,6 @@
 	let ctx;
 	let running = false;
 
-	const r = Math.random();
-
 	onMount(() => {
 		const ctx = canvas.getContext('2d');
 		let frame;
@@ -55,4 +53,4 @@
 <canvas
 	width={32}
 	height={32}
-></canvas>
+></canvas>