message: Fix copy problem in get_context_free_data
diff: @@ -353,9 +353,9 @@ int apply_context::get_context_free_data( uint32_t index, char* buffer, size_t b
  if( buffer_size == 0 ) return s;
  if( buffer_size < s )
  - memcpy( buffer, trx_meta.context_free_data.data(), buffer_size );
  + memcpy( buffer, trx_meta.context_free_data[index].data(), buffer_size );
  else
  - memcpy( buffer, trx_meta.context_free_data.data(), s );
  + memcpy( buffer, trx_meta.context_free_data[index].data(), s );
  return s;
  }
  