fixup! fixup! test: add regression test for using ObjectWrap in worker

Author: addaleax

test/addons/worker-addon-exit/test-with-triggered-gc.js

@@ -16,5 +16,5 @@ if (!isMainThread) {
   throw new Error('exit');
 } else {
   const worker = new Worker(__filename);
-  worker.on('error', common.mustCall(() => {}));
+  worker.on('error', common.mustCall());
 }

test/addons/worker-addon-exit/test.js

@@ -11,5 +11,5 @@ if (!isMainThread) {
   throw new Error('exit');
 } else {
   const worker = new Worker(__filename);
-  worker.on('error', common.mustCall(() => {}));
+  worker.on('error', common.mustCall());
 }