Per c0d31e915c Change VideoSourceInterface::needs_denoising() to return rtc::Optional<bool>
It turns out that it is used as if it has three states: on/off default.
This reverts back to the behaviour prior to https://codereview.webrtc.org/1773993002

BUG=chromium:594434
R=pbos@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1842073002 .

Cr-Commit-Position: refs/heads/master@{#12181}
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