AO3-6491 Change default comment setting to registered users only (#4556) #4005

Job	Run time
rake db:otwseed	1m 19s
rspec spec/controllers	10m 31s
rspec spec/models	5m 22s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 51s
cucumber features/admins	4m 45s
cucumber features/bookmarks	5m 5s
cucumber features/collections	5m 58s
cucumber features/comments_and_kudos	5m 41s
cucumber features/gift_exchanges	6m 12s
cucumber features/importing	2m 54s
cucumber features/other_a	9m 58s
cucumber features/other_b	6m 19s
cucumber features/prompt_memes_a	4m 7s
cucumber features/prompt_memes_b	3m 40s
cucumber features/prompt_memes_c	4m 57s
cucumber features/search	6m 50s
cucumber features/tag_sets	3m 16s
cucumber features/tags_and_wrangling	5m 37s
cucumber features/users	4m 32s
cucumber features/works	12m 48s
	1h 57m 42s

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