Re: [whatwg/fullscreen] Allow fullscreen on already fullscreen elements without user activation (#193)

I just confirmed that Firefox work exactly like Chrome: if an `element` is already fullscreen, calling `element.requestFullscreen()` again without user activation is a no-op from user's perspective (nothing changes) but the `Promise` is rejected and a console error is emitted.  It seems to me that silently accepting the `Promise` in this particular case would be a no-change for users, and a very subtle change for developers.  In particular, the lack of a `fullscreenchange` event would still indicate to developers that nothing has changed.

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