[IMP] note: remove note counter in activities systray
[IMP] note: remove note counter in activities systray

Having a different behavior from other apps present in the systray about
activities is not understandable.

Done after feedback from saas-11.3 internal testing phase. This commit is
linked to task ID 1838917.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo