Fixed ng-switch for comment display

Notes: suggest using "System" instead of "Created" as a switch… or
perhaps a boolean? or a simply a check for a created_by…
ng-if="!comment.created_by" // aka SYSTEM and
ng-if="comment.created_by" // By User (( without the need for the
additional column attribute… ) unless there are going to be different
style comments… I believe we just have regular ones and system
generated ones…