jenerator should do 4 indent in split line with 80 column rule

jenerator does 5 indent, because it splits line just after comma.

```
std::pair<std::string, float> add(const std::string& name,<*here*> false)) {...
```

So right hand side of splited line begins with space.
it is extra space ofr 4 indent rule, let it truncate.