Update asyncWrapper.js

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: kobenguyent

lib/mocha/asyncWrapper.js

@@ -128,8 +128,7 @@ module.exports.injected = function (fn, suite, hookName) {
         suiteTestFailedHookError(suite, err, hookName)
         // Emit event.test.after for each test in the suite
         suite.eachTest(test => {
-          // Attach err and hookName to test for backward compatibility, if needed
-          test.err = err;
+          // Attach hookName to test for backward compatibility, if needed
           test.hookName = hookName;
           event.emit(event.test.after, test)
         })