[IMP] web: use params.displayName for calendar view title

This commit uses params.displayName instead of params.action.name for calendar views titles.
This allows us, among other things, to use the project name as a title
for the project's tasks calendar view, which is more consistent with other views.

Task-2741733

Part-of: odoo/odoo#86008

addons/web/static/src/legacy/js/views/calendar/calendar_view.js

@@ -179,7 +179,7 @@ var CalendarView = AbstractView.extend({
         this.controllerParams.showUnusualDays = utils.toBoolElse(attrs.show_unusual_days || '', false);
         this.controllerParams.mapping = mapping;
         this.controllerParams.context = params.context || {};
-        this.controllerParams.displayName = params.action && params.action.name;
+        this.controllerParams.displayName = params.displayName;
         this.controllerParams.scales = scales;
 
         this.rendererParams.displayFields = displayFields;