[MM-61513] Fix errcheck issues in channels/app/users/users_test.go fixes #29179 (#29188)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -153,7 +153,6 @@ issues:
         channels/app/user.go|\
         channels/app/user_test.go|\
         channels/app/users/helper_test.go|\
-        channels/app/users/users_test.go|\
         channels/app/web_broadcast_hooks_test.go|\
         channels/app/webhook_test.go|\
         channels/jobs/batch_worker_test.go|\