fix(button): prevent default behavior for spacebar

[nikkimk]

What I did

1. Prevented default behavior on spacebar keydown

Testing Instructions

1. Go to Button docs on DP
2. Press Tab to navigate to any button.
3. Press spacebar.
4. Browser window scrolls.

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Latest commit: dbf63ff918007e25670feab3200b6625481b0f57

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