[whatwg/fullscreen] Remove redundant recursive step of fullscreen element ready check (#52)

HTML's "allowed to use" only returns true if the document is in the
top-level browsing context, or if it's connected to it via any number of
iframes, all of which must be in a document to have nested browsing
contexts at all, so this final condition would always be true.

Fixes #50.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fullscreen/pull/52

-- Commit Summary --

  * Remove redundant recursive step of fullscreen element ready check

-- File Changes --

    M fullscreen.bs (5)
    M fullscreen.html (2)

-- Patch Links --

https://github.com/whatwg/fullscreen/pull/52.patch
https://github.com/whatwg/fullscreen/pull/52.diff

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