[w3c/editing] Invalid or identical colors provided to `backColor`/`foreColor`/`hiliteColor` should return `true` instead of `false` (Issue #476)

If the value string provided to `backColor`, `foreColor` or `hiliteColor` is either an invalid CSS color or the current color, the spec states to return false:

https://github.com/w3c/editing/blob/b9fbe88d2319c5667a008804c2364023ce4ccec0/docs/execCommand/index.html#L4201-L4202

As tested in both Firefox and Chrome, we should instead return `true` here.

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