Re: [w3c/editing] contenteditabledisabled is extending `ElementContentEditable` in a wrong way (#332)

@saschanaz I agree. I think this must have been an oversight. I had initially used `partial interface ElementContentEditable` and that was changed to `interface ElementContentEditable` with the latest overhaul of the document, but it really should be `partial interface mixin` as you are saying as it is expanding upon the already existing `interface mixin`. 

Also, it should likely use `DOMCommandTokenList` rather than `DOMTokenList` as we need it extended with the "supported" attribute AFAICT. 

Do you want to make a PR or should I?

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