[heycam/webidl] Definition of "is an array index" makes "-0" an array index (#516)

https://heycam.github.io/webidl/#dfn-array-index-property-name

This links to https://tc39.github.io/ecma262/#sec-canonicalnumericindexstring which special-cases "-0".

This problem was introduced with https://github.com/heycam/webidl/pull/427, the previous definition was OK:
https://web.archive.org/web/20170903233050/heycam.github.io/webidl/#dfn-array-index-property-name

If the current definition were used, it would mean that `document.all["-0"]` should behave like `document.all["0"]`, which it doesn't as implemented.

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https://github.com/heycam/webidl/issues/516