1311: Updated the padding in the dialog box.

[n8thegr8]

To be consistent with other components, we'd like to update the internal padding in dialogs to 20px. The 20px update should be applied to the Header, Body, and Footer areas within dialogs.

The body sections should maintain their 0px top/bottom padding.

PR Checklist

Storybook can be viewed here

• Manually tested across supported browsers

  • [x] Chrome
  • [ ] Firefox
  • [ ] Safari

• [ ] Unit tests written (common at minimum)

• [x] PR has one of the semver- labels

• [ ] Two core team engineer approvals

• [x] One core team UX approval

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