Remove compact prop from DataTable #1189

[dennismphil]

Fixes #1189

Additional description

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Pull Request Review checklist (do not remove)

• npm run lint:fix has been run and linting passes.
• Mocha, Jest (Storyshots), and components/component-docs.json CI tests pass (npm test).
• Tests have been added for new props to prevent regressions in the future. See readme.
• Review the appropriate Storybook stories. Open http://localhost:9001/.
• Review tests are passing in the browser. Open http://localhost:8001/.
• Review markup conforms to SLDS by looking at DOM snapshot strings.
• Add year-first date and commit SHA to last-slds-markup-review in package.json and push.
• Request a review of the deployed Heroku app by the Salesforce UX Accessibility Team.
• Add year-first review date, and commit SHA, last-accessibility-review, to package.json and push.
• While the contributor's branch is checked out, run npm run local-update within locally cloned site repo to confirm the site will function correctly at the next release.

[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify if the committer(s), Dennis Mathew Philip <d***@s***.com>, signed the CLA because they have not associated their commits with their GitHub user. Please follow these instructions to associate your commits with your GitHub user. Then sign the Salesforce.com Contributor License Agreement and this Pull Request will be revalidated.