fix: fix test for ssrHtml, html and runtime

packages/svelte/tests/runtime-browser/samples/fine-grained-hydration-clean-attr/_config.js

@@ -1,12 +1,10 @@
 import { test } from '../../assert';
 
 export default test({
-	html: `<input type="checkbox" name="lang" value="keep" checked />`,
-	mode: ['server'],
-	test({ window, assert, mod }) {
-		assert.htmlEqual(
-			window.document.body.innerHTML,
-			`<input type="checkbox" name="lang" value="keep" />`
-		);
+	html: `<input type="checkbox" name="lang" value="keep" />`,
+	ssrHtml: `<input type="checkbox" name="lang" value="keep" checked />`,
+	test({ window, assert, target, mod }) {
+		const input = target.querySelector('input');
+		assert.equal(input?.checked, true);
 	}
 });