[css-syntax-3] Fix serialization matrix related to CDC-token #6874
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Since double dash
--is a valid identifier by the spec theCDC-tokenis breaking "round-trip" with parsing now when follows after#,-, number or@:#-->=#--(hash-token) +>(delim-token)--->=---(ident-token) +>(delim-token)number-->=number--(dimension-token) +>(delim-token)@-->=@--(at-keyword-token) +>(delim-token)