[w3c/screen-orientation] Page visibility transition can fire when false/true/false happens within a frame (#179)

Due to how the Page Visibility transition portion of https://www.w3.org/TR/screen-orientation/#Screen-orientation-change is written, if a transition from NOT VISIBLE to VISIBLE to NOT VISIBLE happens within a frame, the processing model will currently deliver an event.

I advise adding a new step 1 which exits if the page visibility is NOT VISIBLE.

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