test: fix flaky test-resolve-async

PR-URL: #17957
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/addons/callback-scope/test-resolve-async.js

@@ -5,9 +5,6 @@ const assert = require('assert');
 const { testResolveAsync } = require(`./build/${common.buildType}/binding`);
 
 let called = false;
-testResolveAsync().then(common.mustCall(() => {
-  called = true;
-}));
+testResolveAsync().then(() => { called = true; });
 
-setTimeout(common.mustCall(() => { assert(called); }),
-           common.platformTimeout(20));
+setTimeout(() => { assert(called); }, common.platformTimeout(50));