fix(aspect-ratio): correct example preview

[tay1orjones]

Closes #17093

Surfaced in slack, there were some issues with the aspect ratio examples in the grid elements preview.

Changelog

Changed

• include necessary styles
• update markup to be correct

Testing / Reviewing

• View the grid elements preview, the aspect ratio examples should render correctly and match the same we see in the react storybook (though the color styling is different and expected)
• To do this locally, cd into this preview folder and run yarn && yarn develop

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[tay1orjones]

@kennylam @guidari Hey this is ready for review

[guidari]

Tested locally and the boxes are different now.
🚀

[kennylam]

LGTM!

[carbon-automation]

Hey there! v11.65.0 was just released that references this issue/PR.