remove iffy IIFE

Author: nbierdeman

Diff for: test/screenshot/screenshot.test.js

@@ -24,7 +24,7 @@ const USER_AGENTS = {
 
 jest.setTimeout(120000);
 
-const setupBrowserPage = (async () => {
+const setupBrowserPage = async () => {
     console.log('>>> setupBrowserPage has been invoked');
     const { browser, page } = await openPage(await webpackCompile(BASE_SCREENSHOT_TEST));
 
@@ -39,7 +39,7 @@ const setupBrowserPage = (async () => {
     });
 
     return { browser, page };
-})();
+};
 
 beforeAll(async () => await setupBrowserPage);