Fix username display of comment moderators
Fix username display of comment moderators

... by properly including `deleted_by_id` to the list of users.
`concat` doesn't mutate collection.

ppy/osu-web,nanaya/osu-web,LiquidPL/osu-web,nanaya/osu-web,ppy/osu-web,ppy/osu-web,LiquidPL/osu-web,LiquidPL/osu-web,notbakaneko/osu-web,nanaya/osu-web,LiquidPL/osu-web,LiquidPL/osu-web,ppy/osu-web,nanaya/osu-web,notbakaneko/osu-web,nanaya/osu-web,ppy/osu-web,notbakaneko/osu-web,notbakaneko/osu-web,notbakaneko/osu-web