[w3c/editing] The mapping CSS property for execCommand('underline') and execCommand('strikeThrough') (#241)

The definition in [inline formatting commands](https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html#inline-formatting-commands) still use `text-decoration` for `underline` and `strikeThrough` command. However, the up-to-date [[css-text-decor-4]](https://drafts.csswg.org/css-text-decor-4/#text-decoration-property) makes `text-decoration` a shorthand property, and it may contains the computed values of other longhands, e.g. `text-decoration-color`, `text-decoration-thickness`.

My proposal is: update this to `text-decoration-line` because It's not a good idea to use the shorthand style to represent these commands, and the serialization of the computed value of this shorthand is easy to be impacted by other properties. I can file a PR to update it if this is accepted.

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