Fix 'set-cookie' — case-insensitive values

[peace2000]

Gorhill made set-cookie scriptlet case-insensitive in uBO.

gorhill/uBlock@03d0d8d

Can this change be made into AG as well?

With this change, there would be no need to list every possible case variation in the scriptlet. This:

const allowedCookieValues = new Set([
        'true', 'True',
        'false', 'False',
        'yes', 'Yes',
        'y', 'Y',
        'no', 'No',
        'n', 'N',
        'ok', 'OK',
        'Accept', 'Reject',
        'allow', 'deny',

Could be:

const allowedCookieValues = new Set([
        'true',
        'false',
        'yes',
        'y',
        'no',
        'n',
        'ok',
        'accept', 'reject',
        'allow', 'deny',

And all these forms would be accepted:
true, True, TRUE, TrUe.