Eradicate Twitter public feed as well when not logged in

[weeksling]

The new public Twtitter feed is not blocked by the extension. This feed is particularly egregious, so it would be great if it could be blocked as well.

I found that the main difference is that the document querySelector for twitter doesn't include the public feed. The test-id works, but there is not 4th child. I was able to select the public feed by changing it to :nth-child(3) from this:

document.querySelector(
    'div[data-testid="primaryColumn"] > div:last-child > div:nth-child(4)'
);

to this:

document.querySelector(
    'div[data-testid="primaryColumn"] > div:last-child > div:nth-child(3)'
);

I would add a pull request, but want to confirm what I should do to determine if the user is logged in or not so that it doesn't break the previous logged in version. Would be acceptable for me to find a login element to query for to decide isUserLoggedOut, or alternatively, would it be alright to just add the second query as a conditional after the first one and let it proceed if either exists?

Any advice is helpful. I'll take a look later how to test changes locally and see if I can implement this myself for a pr.