Fix ':has()' pseudo-class due to <forgiving-relative-selector-list>

[slavaleleka]

native :has() pseudo-class takes <forgiving-relative-selector-list>
https://www.w3.org/TR/selectors-4/#has-pseudo

but in v2.0 it seems to take <selector-list> which means that all of selectors in the selector list arg are being matched
https://uploads.adguard.org/slbdzdrvx7z36.png

native implementation also does not signal an error on invalid selector in the list arg
https://uploads.adguard.org/slbdzdrve42fv.png

[AdamWr]

Related issue - if rules like those:

example.org#?#div[data*="\\""]:has(> qwerty)
example.org#?#div:has(> h1)

are added (I guess the first one is incorrect, though document.querySelectorAll('div[data*="\\""]:has(> qwerty)') doesn't throw error), then the second one doesn't work.

Screenshot

Order is important, if I firstly add example.org#?#div:has(> h1) then this one rule works fine, but there are still errors in console and it looks like that every rule below a problematic rule don't work.

[XX-J]

Same type of issue #159.