Incorrect formatting following a line comment in `Map()` call

These are considered correctly formatted:

```pkl
foo =
  Map(
    1, 2,
    3, 4, // hi!
    5,
    6,
    7, 8,
  )

bar =
  Map(
    1, 2,
    3, 4,
    // hi!
    5,
    6,
    7, 8,
  )
```

The two arguments following the line comment should be on the same line