Remove double edit when taking over talkpage

Somehow the call to doEditContent multiplied,  remove the extra
call and cleanup the area while I am there.

This fixes Topic namespace takeover edits from showing up in
Special:Contributions of the posting user.

Change-Id: If1cf486e7c8647e65e8f623ac50e718eccf368bb
Merge "Remove double edit when taking over talkpage"