AO3-5578 Avoid unnecessary DB writes when copying icons #4884

Job	Run time
rake db:otwseed	1m 16s
rspec spec/controllers	13m 23s
rspec spec/models	5m 48s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	10m 13s
cucumber features/admins	7m 59s
cucumber features/bookmarks	4m 57s
cucumber features/collections	6m 50s
cucumber features/comments_and_kudos	6m 59s
cucumber features/gift_exchanges	8m 7s
cucumber features/importing	2m 58s
cucumber features/other_a	11m 43s
cucumber features/other_b	7m 26s
cucumber features/prompt_memes_a	4m 15s
cucumber features/prompt_memes_b	3m 46s
cucumber features/prompt_memes_c	5m 38s
cucumber features/search	7m 57s
cucumber features/tag_sets	4m 42s
cucumber features/tags_and_wrangling	7m 30s
cucumber features/users	5m 20s
cucumber features/works	12m 56s
	2h 19m 43s

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