fix spurious indent and newlines in rendering of nkRecList (#23121)

Rendering of `nkRecList` produces an indent and adds a new line at the
end. However for things like case object `of`/`else` branches or `when`
branches this is already done, so this produces 2 indents and an extra
new line. Instead, just add an indent in the place where the indent that
`nkRecList` produces is needed, for the rendering of the final node of
`nkObjectTy`. There doesn't seem to be a need to add the newline.

Before:

```nim
case x*: bool
of true:
    y*: int

of false:
  nil
```

After:

```nim
case x*: bool
of true:
  y*: int
of false:
  nil
```

0 files changed, 0 insertions, 0 deletions