fix(Command): remove invalid `data-[disabled]` attribute

[kevinmitch14]

cmdk's README.md states that [data-disabled] is available on <Command.Item />. However since the PR that made this data attribute available, there has been no releases. As a result the styling using this data attribute is not being applied.

While making these changes I realised aria-selected is also being used for styling, so I switched this to use the data attribute, data-selected, which is applied by cmdk.

I created an issue on cmdk repo here, https://github.com/pacocoursey/cmdk/issues/192 and will follow this but there is no indication when this will be addressed or if there will be a new release.

Before w/ Calendar CommandItem disabled:

After w/ Calendar CommandItem disabled:

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[kevinmitch14]

This has been updated in the latest cmdk release yesterday https://github.com/pacocoursey/cmdk/releases/tag/v0.2.1. I will bump dep and file a new PR when I can.