Added `embed` and `object` elements in the `vertical-align` selector

[loteoo]

• Added elements in the vertical-align: middle; selector
• Reorder elements so the more common elements are first for understandability / readability

Similarly as https://github.com/csstools/sanitize.css/pull/205, although they are seldom used, I believe these 2 extra elements should share the same vertical-align: middle as the others.