Rounded corners disappear when number-placement is set to outside

[kamelNaroun]

Hi!

I noticed what seems to be a rendering issue with Codly.

When number-placement is set to outside, the code block loses its rounded corners.
Minimal example :

#codly(number-placement: "outside")
```
print("Hello World!")
print("Hello World!")
```
``

#codly(number-placement: "outside", zebra-fill: none)
```
print("Hello World!")
print("Hello World!")
```

Thanks for the great package!