fix bad-UTF-8 check in ParseUnicodeGroup#648
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ParseUnicodeGroup validates the first rune after \p or \P with
!StringViewToRune(...), but that helper returns -1 on failure and a positive byte count on success, so the negation never catches a decode error. A pattern like \p followed by an invalid UTF-8 byte is then reported as kRegexpBadCharRange rather than kRegexpBadUTF8, unlike the \p{...} form which reports bad UTF-8. Compare the result with < 0 as the other StringViewToRune call sites do.