[IMP] project: update task report for easier override

Aliasing the fields in the select clause of the task report allow to do joins latter when inheriting from this object without getting ambiguous fields errors.

related task 2009563

addons/project/report/project_report.py

@@ -66,19 +66,19 @@ class ReportProjectTaskUser(models.Model):
         group_by_str = """
                 GROUP BY
                     t.id,
-                    create_date,
-                    write_date,
-                    date_assign,
-                    date_end,
-                    date_deadline,
-                    date_last_stage_update,
+                    t.create_date,
+                    t.write_date,
+                    t.date_assign,
+                    t.date_end,
+                    t.date_deadline,
+                    t.date_last_stage_update,
                     t.user_id,
                     t.project_id,
                     t.priority,
-                    name,
+                    t.name,
                     t.company_id,
                     t.partner_id,
-                    stage_id
+                    t.stage_id
         """
         return group_by_str