test: fix strictEqual assertion argument in test-tls-ecdh-auto

PR-URL: #23530
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/parallel/test-tls-ecdh-auto.js

@@ -48,7 +48,7 @@ server.listen(0, function() {
  });
 
  client.on('exit', function(code) {
- assert.strictEqual(0, code);
+ assert.strictEqual(code, 0);
  server.close();
  });