[mediacapture-output] Reset `MediaDevices` [[storedDeviceList]] when a new audio output device is exposed by `selectAudioOutput()` (#123)

karlt has just created a new issue for https://github.com/w3c/mediacapture-output:

== Reset `MediaDevices` [[storedDeviceList]] when a new audio output device is exposed by `selectAudioOutput()` ==
This is necessary to update the results of `enumerateDevices()`, if [[storedDeviceList]] [is not](https://w3c.github.io/mediacapture-main/#dom-mediadevices-enumeratedevices) `null`.

But the appropriate solution here may depend on changes for https://github.com/w3c/mediacapture-main/issues/810#issuecomment-892437367

Please view or discuss this issue at https://github.com/w3c/mediacapture-output/issues/123 using your GitHub account


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