[FIX] calendar: shift midnight to current locale

Configure your system to be in the Mexico timezone, configure your Odoo
profile accordingly. Go to calendar, show daily events, add an event at
the end of the day (like 10pm). The resulting event is not visible on
the daily view although it is on the weekly view. The same problem
occurs on the weekly view if the event was create late the last day.

The problem is the initial `search_read` has a domain to filter the
events using 00:00 UTC to 23:59 UTC boundaries. Those boundaries are not locale
aware, they should be shifted to the MX timezone.

opw-2009877

closes odoo/odoo#34247

Signed-off-by: Julien Castiaux <Julien00859@users.noreply.github.com>

addons/web/static/src/js/views/calendar/calendar_model.js

@@ -271,7 +271,6 @@ return AbstractModel.extend({
         this.data.highlight_date = this.data.target_date = start.clone();
         // set dates in UTC with timezone applied manually
         this.data.start_date = this.data.end_date = start;
-        this.data.start_date.utc().add(this.getSession().getTZOffset(this.data.start_date), 'minutes');
 
         switch (this.data.scale) {
             case 'month':
@@ -286,6 +285,9 @@ return AbstractModel.extend({
                 this.data.start_date = this.data.start_date.clone().startOf('day');
                 this.data.end_date = this.data.end_date.clone().endOf('day');
         }
+
+        this.data.start_date.utc();
+        this.data.end_date.utc();
     },
     /**
      * @param {string} scale the scale to set