Re-enable cookie dialog blocking list on Nightly

[antonok-edm]

Issues with a handful of websites were resolved with changes in brave-core. This PR re-enables the list by default on Nightly as per discussion on https://bravesoftware.slack.com/archives/C6YNM6Y5S/p1654120574558859?thread_ts=1654117214.714209&cid=C6YNM6Y5S

[antonok-edm]

Updated to just enable on Nightly, at least until brave/brave-core#12827 makes it to Beta.

[kjozwiak]

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.41.50 Chromium: 102.0.5005.99 (Official Build) nightly (64-bit)
-- | --
Revision | 870f7bcc58dfa811cc68c2186439721385e086d0-refs/branch-heads/5005@{#1125}
OS | Windows 11 Version 21H2 (Build 22000.708)

Launched 1.41.50 Chromium: 102.0.5005.99 using --variations-server-url=https://variations.bravesoftware.com/seed and ensured that Easylist-Cookie List - Filter Obtrusive Cookie Notices was enabled via brave://adblock.

Example (Before Change)	Example (After Change)

[kjozwiak]

Verified as per #268 (comment) and ready to merge. However, the above is pending further discussion. Adding the Uplift/Blocked label.

[kjozwiak]

@antonok-edm should we close this off for now till we have more info? Seems like we're going to need some client side changes re: having modals that let users enable this feature themselves rather than us doing it by default. I don't mind leaving this opened either. Let me know what works for you 👍

[kjozwiak]

Going to close this off as we're going to go with the approach of adding a modal/some type of user interaction that will let them enable the list when Brave detects a cookie permission modal.