fix: balance parentheses in error about wrong content type for action (#9513)

* Balance parantheses

* Add changeset

* Update .changeset/unlucky-garlics-yell.md

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

---------

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

Author: danieldiekmeier

.changeset/unlucky-garlics-yell.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: balance parentheses in error about wrong content type for action

packages/kit/src/runtime/server/page/actions.js

@@ -214,7 +214,7 @@ async function call_action(event, actions) {
 
 	if (!is_form_content_type(event.request)) {
 		throw new Error(
-			`Actions expect form-encoded data (received ${event.request.headers.get('content-type')}`
+			`Actions expect form-encoded data (received ${event.request.headers.get('content-type')})`
 		);
 	}