test: fix test_worker_terminate_finalization

The test was missing an initialization of the global `ref` variable
because there was also an unused local one, leading to failures
like the one seen in #34625.

PR-URL: #34726
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

test/node-api/test_worker_terminate_finalization/test_worker_terminate_finalization.c

@@ -22,7 +22,6 @@ napi_value Test(napi_env env, napi_callback_info info) {
   size_t argc = 1;
   napi_value argv[1];
   napi_value result;
-  napi_ref ref;
   void* bufferData = malloc(BUFFER_SIZE);
 
   NAPI_CALL(env, napi_get_cb_info(env, info, &argc, argv, NULL, NULL));