message: fix bug in chain_plugin with initializing chain_id
diff: @@ -298,6 +298,7 @@ void chain_plugin::plugin_initialize(const variables_map& options) {
  }
  my->chain.emplace(*my->chain_config);
  + my->chain_id = my->chain->get_chain_id();
  // set up method providers
  my->get_block_by_number_provider = app().get_method<methods::get_block_by_number>().register_provider([this](uint32_t block_num) -> signed_block_ptr {
  