Get rid of the logic that does NOT allow revisioning of prepopulated activity

Allow revisioning for prepopulated activities.

– Original issue —
While there is a log entry created in the log table, there's no way in the UI to see who edited a prepopulated activity if it happens to be someone other than the person who created the case, and it's the first time it was edited. It's related to the non-revisioning of first edits for prepopulated activities and that the view activity overlay screen shows created by but not modified by.