[whatwg/fullscreen] Consider forbidding <frame> element from entering fullscreen (#112)

It seems that `<frame>` element is not allowed to be out-of-flow, so it's incompatible with the top layer model, like internal SVG and MathML elements. And it is a deprecated tech anyway.

I propose that we add `<frame>` element to the same place where we rule out `<dialog>` from entering fullscreen.

(This was raised from [a fuzzy bug which triggers an internal assertion in Gecko](https://bugzilla.mozilla.org/show_bug.cgi?id=1415166).)

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