Addresses feedback from @palys-swm here: https://phabricator.ashoat.com/D3827?id=11833#inline-23376

Unfortunately couldn't name the argument queuedChanges because that's already defined in the scope and led to eslint warnings, so had to go with prevQueuedChanges which I'm not a huge fan of and imo makes things a bit less readable.

1. Open ThreadSettingsModal
2. Make some changes (name, description, color)
3. Log the "queued changes"
4. Hit save
5. Ensure that the "queued changes" are made as expected