revert check_stack_trace change

Author: benmccann

packages/kit/src/runtime/client/fetcher.js

@@ -18,13 +18,14 @@ export function unlock_fetch() {
 if (DEV && BROWSER) {
 	let can_inspect_stack_trace = false;
 
-	const check_stack_trace = () => {
+	// eslint-disable-next-line @typescript-eslint/require-await
+	const check_stack_trace = async () => {
 		const stack = /** @type {string} */ (new Error().stack);
 		can_inspect_stack_trace = stack.includes('check_stack_trace');
 	};
 
 	// detect whether async stack traces work
-	Promise.resolve(check_stack_trace());
+	check_stack_trace();
 
 	/**
 	 * @param {RequestInfo | URL} input