fixed bug where GroupedCallbackEntry frame callback was being re-added
fixed bug where GroupedCallbackEntry frame callback was being re-added

Change-Id: I7226ed7e2dea8b8b0de0a7d5dc8a81793ca13ffd

WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS