remove useless comments

src/app/home/web.go

src/app/user/adapter.go

src/app/user/middleware.go

src/app/user/user.go

src/app/user/user_session.go

src/cmd/web/main.go

src/core/auth/auth.go

src/core/hctx/hctx.go

src/core/persistence/db.go

src/core/persistence/error.go

src/core/persistence/session.go

src/core/trace/logger.go

src/core/trans/trans.go

src/core/util/util.go

src/core/web/error.go

src/core/web/router.go

src/core/web/ui.go

src/core/web/web.go