fix test

packages/svelte/tests/validator/samples/tag-non-string/errors.json

@@ -1,7 +1,7 @@
 [
 	{
 		"code": "svelte_options_invalid_customelement",
-		"message": "\"customElement\" must be a string literal defining a valid custom element name or an object of the form { tag?: string; shadow?: \"open\" | \"none\"; props?: { [key: string]: { attribute?: string; reflect?: boolean; type: .. } } }",
+		"message": "\"customElement\" must be a string literal defining a valid custom element name or an object of the form { tag?: string; shadow?: \"open\" | \"none\" | `ShadowRootInit` | (() => `ShadowRootInit` | undefined); props?: { [key: string]: { attribute?: string; reflect?: boolean; type: .. } } }",
 		"start": {
 			"line": 1,
 			"column": 16