Improve 'prevent-fetch' — add 'cors' responseType

[Yuki2718]

prevent-fetch has to set responseType cors to fix AdguardTeam/AdguardFilters#153796. I confirmed it works on uBO 1.54.1 rc2 gorhill/uBlock@e1ae17e However, on AG extension 4.2.241 rekidai-info.github.io#%#//scriptlet('prevent-fetch', 'pagead2.googlesyndication.com') doesn't even prevent the fetch request on my end.