[FIX] project: Use task object instead of self

Issue: Getting recurrence start date from self instead
of current task.

commit ref.: https://github.com/odoo/odoo/commit/b50f5f17ee7140160e72bd37241efb14e14a9484

opw-2628777

closes odoo/odoo#77985

X-original-commit: 864ae7d307dd192ada6f34b2685b5554b77a3756
Related: odoo/enterprise#21514
Signed-off-by: LTU-Odoo <IT-Ideas@users.noreply.github.com>

addons/project/models/project.py

@@ -1233,7 +1233,7 @@ class Task(models.Model):
     def _compute_recurrence_message(self):
         self.recurrence_message = False
         for task in self.filtered(lambda t: t.recurring_task and t._is_recurrence_valid()):
-            date = self._get_recurrence_start_date()
+            date = task._get_recurrence_start_date()
             recurrence_left = task.recurrence_id.recurrence_left if task.recurrence_id  else task.repeat_number
             number_occurrences = min(5, recurrence_left if task.repeat_type == 'after' else 5)
             delta = task.repeat_interval if task.repeat_unit == 'day' else 1