Truncated note in basic.mid

In `basic.mid`, the final piano note is a 1000ms note event, with a unclosed pedal event - however when we tokenize this comes out as.

```json
[
"piano",
36,
120
],
[
"onset",
4000
],
[
"dur",
1560
]
```

I think the issue might be [here](https://github.com/EleutherAI/aria-utils/blob/main/ariautils/midi.py#L275-L278)

```python
final_tick = self.note_msgs[-1]["data"]["end"]
```

I guess it's snapping to the final drum note? and it should be 2000ms if it snaps to the final strings note. Here's a possible solution, but I think it could be quite expensive at scale.

```python
final_tick = max([note["data"]["end"] for note in self.note_msgs])
```