Don't move type param opening parenthesis comments

Given:

```python
type foo[  # comment
    a,
    b
] = ...
```

We format it as:
```python
type foo[a, b] = ...  # comment
```

But, the list formatting is from:
```python
foo = [  # comment 0
    a,
    b
]
```

To:
```python
foo = [  # comment 0
    a,
    b,
]
```