Fixes #8075

The problem is that display: block by default lets its content overflow vertically, but only grows to 100% horizontally. This could be fixed in two ways

1. Make the content have display: inline-block
2. Make the content have a fixed width

I fixed the issue by giving the content container of ScrollArea.Autosize width: min-content. I think that's the least intrusive way of handling this issue that hopefully doesn't break anything else. This way the container resizes whenever the content changes its width.

I deliberately only applied the fix to ScrollArea.Autosize as applying it to ScrollArea messes up other components like MultiSelect.

If anyone has a better solution to this problem feel free to let me know. I kinda worry that applying these styles messes up other components relying on ScrollArea.Autosize down the line.