[w3c/permissions] Rename "speaker" to "speaker-selection" + media devices are secure context (#218)

The `"speaker"` permission is used by the new [selectAudioOutput](https://w3c.github.io/mediacapture-output/#dom-mediadevices-selectaudiooutput) API, but is being renamed in https://github.com/w3c/mediacapture-output/pull/96 for consistency with the reintroduced permissions policy of the same name. https://github.com/w3c/webappsec-permissions-policy/pull/398

The old name had folks thinking an iframe without `allow="speaker"` would be silent. The new name clarifies the powerful feature in question is instead the ability to request and output to non-default audio output devices.


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/218

-- Commit Summary --

  * Rename "speaker" to "speaker-selection" + media devices are secure context.

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/w3c/permissions/pull/218.patch
https://github.com/w3c/permissions/pull/218.diff

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