fix go1.15 lint error in modules/public/public.go (#12707)
fix go1.15 lint error in modules/public/public.go (#12707)

Co-authored-by: Lauris BH <f3041c4c693c07149804ea655e75ee8bb856bd26@nix.lv>
vdbt/gitea,go-gitea/gitea,vdbt/gitea,sapk-fork/gitea,cez81/gitea,go-gitea/gitea,sapk-fork/gitea,cez81/gitea,sapk-fork/gitea,cez81/gitea,go-gitea/gitea,sapk-fork/gitea