[FIX] google_calendar : rename 'class' field into 'privacy'
[FIX] google_calendar : rename 'class' field into 'privacy'

Complete the commit dae0157d7b99db163533172a466d5baabd4de638. Thanks to jke ;)

ygol/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo