test: remove unused e variable in catch statement

PR-URL: https://github.com/nodejs/node/pull/23465
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

test/parallel/test-domain-with-abort-on-uncaught-exception.js

@@ -50,7 +50,7 @@ if (process.argv[2] === 'child') {
       if (process.argv.includes('useTryCatch')) {
         try {
           throw new Error(domainErrHandlerExMessage);
-        } catch (e) {
+        } catch {
         }
       } else {
         throw new Error(domainErrHandlerExMessage);