AO3-6704 Use URL from current host in abuse report response mailer preview #3932

Job	Run time
rake db:otwseed	1m 10s
rspec spec/controllers	10m 47s
rspec spec/models	5m 27s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 41s
cucumber features/admins	4m 47s
cucumber features/bookmarks	5m 15s
cucumber features/collections	5m 58s
cucumber features/comments_and_kudos	6m 42s
cucumber features/gift_exchanges	6m 59s
cucumber features/importing	2m 43s
cucumber features/other_a	10m 32s
cucumber features/other_b	6m 18s
cucumber features/prompt_memes_a	3m 55s
cucumber features/prompt_memes_b	3m 41s
cucumber features/prompt_memes_c	5m 0s
cucumber features/search	6m 38s
cucumber features/tag_sets	3m 7s
cucumber features/tags_and_wrangling	5m 54s
cucumber features/users	4m 45s
cucumber features/works	13m 20s
	2h 0m 39s

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