remove solo: true

Author: Rich-Harris

packages/svelte/tests/runtime-runes/samples/reactive-to-string/_config.js

@@ -1,8 +1,6 @@
-import { flushSync } from '../../../../src/index-client';
 import { test } from '../../test';
 
 export default test({
-	solo: true,
 	html: `
 		<div>[object Set Iterator] [object Set Iterator] [object Set Iterator]</div>
 		<div>[object Set Iterator] [object Set Iterator] [object Set Iterator]</div>