Follow up: Update activities about moving content between groups

Problem
DS-4551 - Update activities about moving content between groups
When an event or topic is moved to another group, then the activity surrounding the creation of the content will be deleted in the previous group and created in the new group.

The activity that the topic was created was moved, but activity that someone commented is still in old group: http://prntscr.com/jgk5gg

Solution
Delete message that someone create comment on node in the group.