[mediacapture-screen-share] Pull Request: Remove unintended requirement that audio be included

eladalon1983 has just submitted a new pull request for https://github.com/w3c/mediacapture-screen-share:

== Remove unintended requirement that audio be included ==
Fix #101.

See https://github.com/w3c/mediacapture-screen-share/pull/175


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