message: Fix double-setting the primary key
  `skip_primary` was initialized to the wrong value, so it was never actually
  skipped. This appears to have not caused any functional problems (I couldn't
  find a way to write a test that would fail as a result), but it is a small
  performance hit.
diff: @@ -189,7 +189,7 @@ Object Object::create(ContextType& ctx, std::shared_ptr<Realm> const& realm,
  size_t row_index = realm::not_found;
  TableRef table = ObjectStore::table_for_object_type(realm->read_group(), object_schema.name);
  - bool skip_primary = false;
  + bool skip_primary = true;
  if (auto primary_prop = object_schema.primary_key_property()) {
  // search for existing object based on primary key type
  auto primary_value = ctx.value_for_property(value, primary_prop->name,
  