Remove unnecessary method call in events view
Since User#to_param already returns User#username, we don't need to
pass in the user's username. Changing this also helps us obey LoD.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Since User#to_param already returns User#username, we don't need to
pass in the user's username. Changing this also helps us obey LoD.