jsc: fix weakref

Author: ammarahm-ed

test-app/runtime/src/main/cpp/runtime/weakref/WeakRef.cpp

@@ -27,7 +27,7 @@ void WeakRef::Init(napi_env env) {
 
     napi_value wr;
     napi_get_named_property(env, global, "WeakRef", &wr);
-   if (!napi_util::is_null_or_undefined(env, wr)) {
+   if (napi_util::is_null_or_undefined(env, wr)) {
        napi_value cons;
        napi_define_class(env, "WeakRef", NAPI_AUTO_LENGTH, New, nullptr, 2, properties, &cons);
        napi_set_named_property(env, global, "WeakRef", cons);