[w3c/uievents] Ensure prose for key press handling works well with KeyboardLock (#158)

The [KeyboardLock spec](https://w3c.github.io/keyboard-lock/) describes part of how keyboard events should be dispatched when keyboard-lock is enabled.

We need to ensure that that algorithm is consistent with the algorithms presented in UIEvents (and HTML)

See also the comments in [KeyboardLock#3](https://github.com/w3c/keyboard-lock/issues/3).

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