Re: [csswg-drafts] [css-text-decor] text-decoration-width claims to be a sub-property of text-decoration, but text-decoration disagrees. (#3993)

Looks like the definitions from L3 generally haven't been imported to L4. The answer should be, "text-decoration is able to parse it in", so

```
text-decoration:  | | <'text-decoration-line'> || <'text-decoration-style'> || <'text-decoration-color'>
```

becomes 

```
text-decoration:  | | <'text-decoration-line'> || <'text-decoration-style'> || <'text-decoration-color'>|| <'text-decoration-thickness'>
```


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