Update 2 Twitter Handels in harp.json

[Rudimental]

Currently, the links to Twitter on Kapunahele Wong's and Ward Bell's bios both point to https://twitter.com/undefined. These links are accessible when their bios are opened. This PR adds their proper Twitter handle, so their respective links point to the right place.

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[Rudimental]

I signed it, googlebot.

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CLAs look good, thanks!

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CLAs look good, thanks!