automatic alignment does too much when we have blocks within blocks

#105 improved matters, but still left this:

> I have to work through the case where

```
tags = {
  thing = "whatever"
}
```

> because currently it becomes

```
tags    = {
  thing = "whatever"
}
```

I don't use the Tabular integration myself and am unlikely to do anything about this, but merge requests that fix it would be welcome!