style(test): apply prettier to preventBadQueries rewrite

Cosmetic-only; the rewrite in 592db81 used a two-line wrap that
Prettier flattens to one line at 100 cols, which CI's `format:check`
caught. No behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: tkirda-bison

test/autocomplete.test.js

@@ -324,8 +324,7 @@ describe("Autocomplete Async — preventBadQueries", () => {
         // query attempt — ajax-succeeded, ajax-failed, AND bad-query-short-
         // circuit — so it's a single deterministic synchronisation point.
         const searchResolvers = [];
-        const nextSearchComplete = () =>
-            new Promise((resolve) => searchResolvers.push(resolve));
+        const nextSearchComplete = () => new Promise((resolve) => searchResolvers.push(resolve));
 
         $.mockjax({
             url: serviceUrl,