[FIX] calendar: set color on right partner

When doing a sudo on top, the fields are accessed with user 1 but the set is
also made with user 1.
meeting.user_id.partner_id.id is correctly computed but
meeting.partner_color_id is not set for the current user (return 0)

All events were in the same color

Introduced at b669c71aa3

opw-1829793
Closes #23923

addons/calendar/models/calendar.py

@@ -841,8 +841,8 @@ class Meeting(models.Model):
 
     @api.multi
     def _compute_color_partner(self):
-        for meeting in self.sudo():
-            meeting.color_partner_id = meeting.user_id.partner_id.id
+        for meeting in self:
+            meeting.color_partner_id = meeting.sudo().user_id.partner_id.id
 
     @api.constrains('start_datetime', 'stop_datetime', 'start_date', 'stop_date')
     def _check_closing_date(self):