Remove explicit list of embed parameters

[bdougherty]

I don't remember why this was added in the first place (maybe so we only check valid attributes?) but it has become a bit of a maintenance burden. The data attributes used are already prefixed with data-vimeo- and we know the few special-case ones that can be ignored for oEmbed (data-vimeo-id, data-vimeo-url, data-vimeo-initialized and data-vimeo-defer), so we should be able to safely remove this list.