[FIX] google_calendar: fixing request for exclusion
[FIX] google_calendar: fixing request for exclusion

Activate Google Synchronization, create on OE a recurrent event (no allday)
synchronize the calendar, then delete an event of the recursion on OE,
sync again on OE.

An error will popup in the console. There is a typo in the variable
sent to the google API.
https://developers.google.com/calendar/v3/reference/events

closes odoo/odoo#40625

X-original-commit: 299bb8a995fb8058bbc0b9e4d71b67d3e765c6af
Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>

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