Increase expectations for fix to #15819

one of the cases we CAN hydrate

packages/svelte/tests/hydration/samples/cloudflare-mirage-borking-2/_config.js

@@ -1,6 +0,0 @@
-import { test } from '../../test';
-
-// https://github.com/sveltejs/svelte/issues/15819
-export default test({
-	expect_hydration_error: true
-});

packages/svelte/tests/hydration/samples/cloudflare-mirage-borking-2/_expected.html

@@ -1 +0,0 @@
-<p>start</p><p>cond</p><!---->

packages/svelte/tests/hydration/samples/cloudflare-mirage-borking-2/main.svelte

@@ -1,4 +1,5 @@
 <script>
+	// https://github.com/sveltejs/svelte/issues/15819
 	const cond = true;
 </script>