Update App.svelte

i think checked is a better variable name in this case

site/content/tutorial/06-bindings/03-checkbox-inputs/app-b/App.svelte

@@ -1,18 +1,18 @@
 <script>
-	let yes = false;
+	let checked = false;
 </script>
 
 <label>
-	<input type=checkbox bind:checked={yes}>
+	<input type=checkbox bind:checked={checked}>
 	Yes! Send me regular email spam
 </label>
 
-{#if yes}
+{#if checked}
 	<p>Thank you. We will bombard your inbox and sell your personal details.</p>
 {:else}
 	<p>You must opt-in to continue. If you're not paying, you're the product.</p>
 {/if}
 
-<button disabled={!yes}>
+<button disabled={!checked}>
 	Subscribe
-</button>
+</button>