Task 1889687 adds the activity view to Studio>Views, the view is represented by
icon fa-clock-o. Task 1894990 was supposed, among other things, to change the
current activity view icon (fa-th) to fa-clock-o. Since this task was not merged
it creates an inconsistency between the 'view switcher' and Studio.
Task 1902826
closesodoo/odoo#29392