Add the missing comparison for 'goto_state'

```C++
return dfa == rhs_.dfa &&
states == rhs_.states &&
state == rhs_.state &&
transitions == rhs_.transitions &&
transition == rhs_.transition &&    // <===
 end_state == rhs_.end_state &&
id == rhs_.id &&
unique_id == rhs_.unique_id &&
goto_dfa == rhs_.goto_dfa &&
bol_index == rhs_.bol_index &&
eol_index == rhs_.eol_index &&
token == rhs_.token &&
transition == rhs_.transition;      // <===
```