[w3c/screen-orientation] Heads up: refs to `pagevisibility` (external now visibile) about to be removed (#205)

See https://github.com/w3c/page-visibility/pull/73
Most of the page visibility spec is moving into the HTML Spec (see https://github.com/whatwg/html/pull/7153), and calls are to be made explicitly instead of the "hook" (`external-now-visible-algorithm`).

Since this spec appears to rely on this ref, opening this issue to track switching to being called directly.

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