message: third times the charm I guess (fix for producer_plugin_impl::on_block)
diff: @@ -66,7 +66,7 @@ class producer_plugin_impl {
  active_producers.begin(), active_producers.end(),
  boost::make_function_output_iterator( [&]( const chain::account_name& producer )
  {
  - if( producer != bsp->head.producer ) {
  + if( producer != bsp->header.producer ) {
  auto itr = std::find_if( active_producer_to_signing_key.begin(), active_producer_to_signing_key.end(),
  [&](const producer_key& k){ return k.producer_name == producer; } );
  if( itr != active_producer_to_signing_key.end() ) {
  