[FIX] google_calendar: event duplication during sync to google

With User A <a@gmail.com> and user B <b@gmail.com> both syncing
their calendar with Google.
If User a created an event X, adding as attendee himself and user B,
and then synced his calendar to Google, a new event was
created in User B Google Agenda automatically, representing the
invitation.
At this stage, X appears only once, in the four calendars
(Odoo cal for A, Odoo cal for B, Google Cal for A, Google Cal for B)

If user B then synced his calendar to Odoo, the event X was
duplicated in three of the calendars (Odoo cal for A and B, Google cal for B)

If then user A synced again his calendar with Google, the event X
was duplicated in the four calendars.

From then, a duplicate loop began, at each sync of the both user calendars.

opw-639419

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