Add option to prevent users from reporting their own post #1205

https://github.com/Kunena/Kunena-Forum/pull/2523
To me this looks wrong.. Next file uses:

     if ($this->me->isModerator() || $this->config->user_report || !$this->config->user_report && $this->me->userid !== $this->message->userid)

Moderator or user can report himself or user doesn't report himself.. 

BTW, "!$this->config->user_report && " isn't needed.