Fixed bug 328616

As reported in https://bugs.kde.org/show_bug.cgi?id=328616, when a user accepts an invitation to an event, when it is loaded on Google Calendar, it creates a new event with the user as the organizer. To prevent this, the "import" API should be used instead of the "insert" API. With this change, the organizer is checked against the account name of the user: if they match, the event is created (previous implementation), otherwise the event is imported ("import" API).

I tested this on my system: I accepted an invitation by another user, and it imported the event by correctly marking the other user as the organizer.