[w3c/screen-orientation] Fix iframe promise rejection in unloading document cleanup (PR #268)

Resolves specification inconsistency where iframe documents with pending orientation lock promises were not having their promises rejected during document unloading.

The previous algorithm would abort cleanup steps for non-top-level documents before rejecting pending promises. This fix separates two concerns:
1. Promise rejection (happens for ALL documents including iframes)
2. Screen orientation unlocking (only happens for top-level documents)

This aligns the specification with the Web Platform Test expectations in active-lock.html which expects iframe lock promises to be rejected with AbortError when the iframe document is unloaded.

Closes #257 

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/enter_bug.cgi)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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

  https://github.com/w3c/screen-orientation/pull/268

-- Commit Summary --

  * Fix iframe promise rejection in unloading document cleanup

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/268.patch
https://github.com/w3c/screen-orientation/pull/268.diff

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